I want to tell you how much I enjoy watching all your videos. I am only casually interested in robotics; I have no real applications that I could use for myself. But I very much like watching your videos because you show the entire process of evaluating motors and mechanisms. I have been a CNC and 3D printing enthusiast for over 25 years now, and robotics may become affordable enough in the future that I might begin to dream up uses that I can’t envision today. But in the meantime I find great joy in watching all of your projects and experiments. You are one of my favorite channels, and I hope you continue with your videos because they are so informative and entertaining. I love how RUclips brings the world together.
There is something reassuring about your way of explaining and demonstrating your ideas and progress that I really like. Your could be a good politician.
Watching it jump in his hand when he changes direction is both scary and beautiful. Like watching that guy with the bear sanctuary play with his bears.
Wow, for a robotic student seeing these actuators is sooo pleasing to the eyes. If possible plz do make a video of some of the options for the feedback systems that we can use in case of using a normal DC motor with gearbox (not a stepper motor) for the actuators. This is my project actually sothat we can use the DC motor of our choice.
So basically, making these nice cheap multipole actuators completely worthless by switching back to a design with no holding torque, phase backlash, big EMF capacitors, and terrible positional control.
In minute 4:37 you mention that you implemented two termination resistor on the cable that goes from the CanBus shield to the RMD X8 Motor. Please can specify which termination resistors you used and in which sequence?
@@Skyentific Yes! I'd love to see more introductory stuff from you, or at least a more in depth explanation for your projects. I love your work and would love to understand more of it!
@@eglintonflats That's one of the issues, there are so many books on the subject, where does one start and how do they progress and in which direction?
Thank you so much for sharing these! I've been looking for something like this for a very long time for the purpose of building a very advanced camera slider!
Very well done presentation! I came because of James Bruton youtube channel and he loves your channel also! I had to become a subscriber, because of your honesty! Thank you very much!!!
A very interesting option is a motor wheel from a gyro scooter. 600rpm and 350W nominal. very large Nm and no backlash. the price for a motor is only $ 30-40. I controlled using a VESC controller. very well you can configure the necessary PID. I will assume that the difference in Nm is ~ 1.5. in favor of gear with play :-( but just by increasing the voltage you can easily raise the current -> Nm. I turned the 36V motor from 60V. without heating I could not give a continuous load. but the most important thing is WITHOUT BACK LASH!
500 dollars for every actuator!!!??? Very expensive, also torgue without speed is not an indication, you can have big gears with small motor and create huge torgue but small speed ... speed should be mentioned in the testings
One of the links above has a tab for specs, and it says 250 rpm. The other (the PRO version) doesn't have a speed. I agree, I'd really want to know both speed & torque before spending this much. Having said that, 20-40 Nm is _a lot_ of torque for something so small.
Any idea on whether MyActuator is still supporting these motors? They seem to have gone offline and aren't responding to support messages. Using this exact same setup and code, can't get any communication with the motors, even with the debug software.
This is the servo that I mentioned to you on your previous video but you haven't replied to my question. Anyway, yeah the good thing is it can read position in multi-turn. But when ever you turn off the power and power again, the servo will lost its absolute position, so you may need to calibrate every time you reboot the servo to get the absolute output shaft position. It's just a small issue, just point out to you :) anyway nice video again!
Do you have any idea what library he's using? I can find an "mcp_can" library by searching on github, but none of the ones I found were compatible with his code.
Welcome. I have a question about the universal robot arm, how is the mechanism of moving the arm by hand and then storing the movement, explain this please
Does the No driver model come with a encoder still? I’d like to use odrive. Wasn’t sure if these have a driver board with a integrated encoder on a outboard shaft or some thing similar
10:06 ...nice socks. lol Great job on the video, it is very informative. I always wondered how these devices worked. I have been very interested in this technology, since seeing the HAL (Hybrid Assisted Limbs) exoskeleton in a video, that was developed by Cyberdyne in Japan. Thanks for sharing your knowledge. --- Alfredo @ Tyler, TX, USA
To build robotic arms, you need lightweight motors with high torque. If you compare continuous torque to motor weight ratio, Dynamixel H54 is the best.
"Great video! I'm curious about the actuator's flexibility. Can you also adjust the stiffness and drag values on this actuator, similar to what's possible with the Mini Cheetah clone actuator?"
Thank you for this video. It helps me a lot. Please could you explain how information from the motor can be read on the Mac. Which program is needed for that? It is shown on the video at 7 min 28 sec.
Hi, Could you explain how to adjust PID values with that? For reference, I have a plan to develop SCARA arm (H: 68cm, L1: 30cm, L2:30cm) using use RMD X8 Pro.
Great review. I would like to know if this motor has an internal brake that can prevent it from turning when there is no power to the motor. Just like in an industrial robot where the robot arm segments stay in place when the robot is turned off.
Great content, I find your videos very informative, however could you look at the feasibility of using clearpath servo motors for robotic arm projects?
Здравствуйте. Подскажите пожалуйста сопротивление у обмоток этих моторов. Нужно попробовать их использовать с другими CAN контроллерами. Спасибо. Надеюсь найдете время померить. Хорошего дня!
I want to make a correction here " high voltage doesn't mean low current". In Robotics torque is more of an important factor than RPM. So 48V means it's designed to carry more current. I am expecting that 48V & 24A can generate around 24Nm effectively by using a 6:1 Gear ratio for your first motor.
Skyentific what will be if you increase torque it will corrupt actuator? for example if i want use actuator for milling wood plate i should use some reduction gear ?
Hi! we are experiencing difficulties trying to find a good way to home the actuator, it comes with an absolute encoder, but unfortunately it is not mounted on the output shaft, but on the motor shaft, so we can detect home in the 0-360 range of the motor shaft, however, we dont know on which of the 6 positions of the gearbox output it is on... not without adding an extra encoder, limit or home switch and a routine. Are there any similar motors out there that do have an output shaft encoder, or how do you recommend we go around this? Thanks!
Hello. Can you please described me the torque mode? Do i understand correctly, that if i want to rotate a motor with constant speed, and constant torque, than my input via can is only :"direction, speed, desired torque"? Or desired torque is set only via config limiting current? Can i during motor operation change all these parameters? Thank you very much
Great review! Could I ask you if you have any idea about the backdrive reistance? With this I means what effort (Nm) is needed to manually drive the output shaft when the actuator is turned off. In my project it is very important that the device can be manually overrriden without adding too much resistance. Thank you in advance!
Great channel... Love your explaination and your details... i would lo e to build 7 dof to hold a industral router. Question have you ever looked at clear path servo motors?
Thank you. Theoretically, if you would like to make serial robot, clearpath servos are a little bit heavy for its torque. You would need to use a large reduction gearbox. Personally, I never used these servos.
@@Skyentific i was thinking of using a 5kw atc spindleon the end of the arm.... aprox 20kg....which means redesigning your fram i would..love to 3d print a mold of it..would require redesigned heavy duty supports and thicker bracing support and cast the peices from carbon fiber shell filled mineral cast expoxy....yes...much heavy industrial robotic arm..using clearpath servo and..harmonic gears... Where can find a free 3d cad model of this or simular 7 dom arm
I m thinking of using those strong and cheap compaired to this , e-skateboards brushless motors along with odrive or FSESC that cost one fourth of this actuator for a robotic arm
I would love to make a 2 axis gimbal platform for a telescope/camera out of something like this for tracking terrestrial things like rocket launches and races. Do they provide any kind of measure of mechanical vibration in the drive? What is your subjective experience based on tinkering with them?
Hi, I have a trouble with the CAN BUS conection; the Arduino code works but the motor don´t move; I probe the same code with other motor and works good. I think that the firmware is the trouble. So too probe it with the UART drive and works good, please HELP ME!!
@@clementd4984 I found the problem. The motor driver malfunction and it was replacement with other new. You have disoldering the internal wiring and put in the new driver with other soldering. Is a fabrication fail and GYEMS no gave me a guarantie. Very bad.
@@perezmiguel3877 Well, this sounds bad... 😐 Can you share your code fore the CAN communication? I tried several things (including thencode in this video) with a MCP2515 module and with a CAN shield from Keyestudio, and it doesn't work, but I'm not 100% sure that my code is correct. 🙏
@E K the code is the same used in this video and works very well, review if you made correctly the CAN bus line and put the correct and put the correct dial code switch for the motor address
Most probably it would not work. The torque depends on magnetic flux. If you put more turns with thin wires, they will cary the same flux as thick wire with less turns. So it will change KV of the motor but not the torque.
The best actuator (in terms of torque ) I've seen so far are these RDrive rozum.com/servomotors/#available with integrated CAN controller and 1:100 Harmonic drive... But at a price...The whole arm is 23k
I see lot of Servo motors (like ClearPath Servo) which gives good torque, speed and precision. And it is around 35$. But this actuators are 500$. So, im wondering how do these actuators make difference with those servos. This is just a question and im new to robotics. Please assist me so that I can design my robot - The Best.
Thank you. The cheap servos usually not powerful enough for the robot arm (with at least 1kg payload and human like reach). Also this particular servos (ClearPath) are very heavy and not very powerful. That is why in robotics they usually use harmonic drive actuators or MIT mini cheetah like actuators. Harmonic drive actuators usually cost many thousands. Thus standard robot arm with 6 axis would cost at least 10-20 thousands.
Also, Im wondering like, servos contains dc motor, gear reduction system and feedback system. Actuators that i saw in your video has same components. Then how can the weights of both vary this much? Servos - 11kg and Actuator < 1 kg? 😅😅😅😅
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Best way to support my channel is to like, to comment, to share the video and to subscribe.
the Best way to support your channel is to make companies with you !!!
@Simon Julius ...what does that have to do with this video? it's not relevant to this channel, or the technology being tested in this video.
Здравствуйте! У меня почему то на прямую через их драйвер не конектется, пишет
It has been super strange to see something I designed copied by so many Chinese vendors, and then reviewed by people on the internet.
You might as well release the CAD now so at least the clones are of better quality ; )
Miss your periodic videos. Hope Life is good at Boston D.
Could you give me a link so i can buy from you?
Nice work tends to end up in some fun places.
Ben Katz if this is a great product, why not? :)
I want to tell you how much I enjoy watching all your videos. I am only casually interested in robotics; I have no real applications that I could use for myself. But I very much like watching your videos because you show the entire process of evaluating motors and mechanisms. I have been a CNC and 3D printing enthusiast for over 25 years now, and robotics may become affordable enough in the future that I might begin to dream up uses that I can’t envision today. But in the meantime I find great joy in watching all of your projects and experiments. You are one of my favorite channels, and I hope you continue with your videos because they are so informative and entertaining. I love how RUclips brings the world together.
There is something reassuring about your way of explaining and demonstrating your ideas and progress that I really like. Your could be a good politician.
Watching it jump in his hand when he changes direction is both scary and beautiful. Like watching that guy with the bear sanctuary play with his bears.
I am amazed! I though something like this would be far more difficult. Thank you for opening my eyes to new possibilities.
Dude, it's so great that world have such a wonderful videomaker. I'm appreciate that your content is full of practical use and a little bit of humor.
your video is really helpful for me (i'm a programmer in s.korea). thank you so much.
This channel is heaven! thank you so much for your testing. THIS IS GREAT!
Professional content and very clear and light way to explain
"It's almost like on those fancy RUclips channels", heheh this is a fancy RUclips channel! working on frickin' robot arms
Thanks!
at those prices for each of those it better be.
The links are down, just wanted you to notify :)
Wow, for a robotic student seeing these actuators is sooo pleasing to the eyes.
If possible plz do make a video of some of the options for the feedback systems that we can use in case of using a normal DC motor with gearbox (not a stepper motor) for the actuators.
This is my project actually sothat we can use the DC motor of our choice.
So basically, making these nice cheap multipole actuators completely worthless by switching back to a design with no holding torque, phase backlash, big EMF capacitors, and terrible positional control.
Hi! Where can I find the motor control protocol documentation that is used in this video?
In minute 4:37 you mention that you implemented two termination resistor on the cable that goes from the CanBus shield to the RMD X8 Motor.
Please can specify which termination resistors you used and in which sequence?
Can u please do a video on robot kinematics
I should! Many people asked me about this. I will look into it.
@@Skyentific Yes! I'd love to see more introductory stuff from you, or at least a more in depth explanation for your projects. I love your work and would love to understand more of it!
If you can read, then there are numerous books on the subject of robotics kinematics but it requires an effort
@@eglintonflats They don't have a sexy accent though.
@@eglintonflats That's one of the issues, there are so many books on the subject, where does one start and how do they progress and in which direction?
Thank you so much for sharing these! I've been looking for something like this for a very long time for the purpose of building a very advanced camera slider!
Thank you for making these videos.
Good to find someone who knows so much. Liked and subscribed.
Thank`s you to share your work with the best attitude!!!
Very well done presentation! I came because of James Bruton youtube channel and he loves your channel also! I had to become a subscriber, because of your honesty! Thank you very much!!!
You're a cool dude, genuinely. I dig it. Definite like and subscribe. Keep going.
thank you for such video
A very interesting option is a motor wheel from a gyro scooter. 600rpm and 350W nominal. very large Nm and no backlash. the price for a motor is only $ 30-40. I controlled using a VESC controller. very well you can configure the necessary PID.
I will assume that the difference in Nm is ~ 1.5. in favor of gear with play :-(
but just by increasing the voltage you can easily raise the current -> Nm. I turned the 36V motor from 60V. without heating I could not give a continuous load.
but the most important thing is WITHOUT BACK LASH!
This is so helpful for my 6 axis 3d printer
Excellent video
500 dollars for every actuator!!!???
Very expensive, also torgue without speed is not an indication, you can have big gears with small motor and create huge torgue but small speed ... speed should be mentioned in the testings
total sold 0 items, product reviews 0
@@kokotmkokot4926 well this video was a review ;)
One of the links above has a tab for specs, and it says 250 rpm. The other (the PRO version) doesn't have a speed. I agree, I'd really want to know both speed & torque before spending this much. Having said that, 20-40 Nm is _a lot_ of torque for something so small.
@@AlecMuller he linked a website in the video description. It has a table of specs if you scroll about halfway down.
I really appreciate these videos, I wish you great success.
Очень познавательное видео, большое спасибо)
Большое спасибо за добрый комментарий!
Any idea on whether MyActuator is still supporting these motors? They seem to have gone offline and aren't responding to support messages. Using this exact same setup and code, can't get any communication with the motors, even with the debug software.
Hey, great review! Do you still have the documentation of this motor by any chance? It would be really useful. Thanks
Thank you for sharing! Very good info.
Thank you for your comment!
Great videos thank you so much, this helped me so much.
Пора открывать производство таких приводов! В будущем робот без таких будет считаться стим панком! Танец в конце- топ!
Спасибо. Я думаю что скоро такие актуаторы начнут дешеветь.
@@Skyentific по ходу сам начну делать
@@Skyentific если покажешь нутрянку
As usual, awesome content! Thank you for sharing.
This is the servo that I mentioned to you on your previous video but you haven't replied to my question. Anyway, yeah the good thing is it can read position in multi-turn. But when ever you turn off the power and power again, the servo will lost its absolute position, so you may need to calibrate every time you reboot the servo to get the absolute output shaft position. It's just a small issue, just point out to you :) anyway nice video again!
Do you have any idea what library he's using? I can find an "mcp_can" library by searching on github, but none of the ones I found were compatible with his code.
Thanks for the nice video and consistent test method.
Nice video and actuator. Is it possible to review some cobot (collaborative robot) joint actuators like Universal Robots, Han's robotics?
Ваш английский становится лучше радует, спасибо за видео)))
Спасибо! Приятно слышать, а то все только и критикуют мой английский! :)
Welcome. I have a question about the universal robot arm, how is the mechanism of moving the arm by hand and then storing the movement, explain this please
These are awesome! Great video
Just subscribed. Thanks for the great information and resources!
Does the No driver model come with a encoder still? I’d like to use odrive. Wasn’t sure if these have a driver board with a integrated encoder on a outboard shaft or some thing similar
Thx for your videos!
Thanks for the good review , very useful
66.7% Positive feedback
for an aliexpress store only open since Oct 2019 seems kinda poor?
Do you wish that these motors had a higher gear reduction? 1000 RPM seems high for a robot arm application
10:06 ...nice socks. lol
Great job on the video, it is very informative. I always wondered how these devices worked. I have been very interested in this technology, since seeing the HAL (Hybrid Assisted Limbs) exoskeleton in a video, that was developed by Cyberdyne in Japan.
Thanks for sharing your knowledge. --- Alfredo @ Tyler, TX, USA
To build robotic arms, you need lightweight motors with high torque. If you compare continuous torque to motor weight ratio, Dynamixel H54 is the best.
nice video really like it,,, is it necessarily to use termination resistor ??!! and why??
@14:44, let’s increase the torque with the pressure of My Magic hand.
Nice video !
Thank you!
"Great video! I'm curious about the actuator's flexibility. Can you also adjust the stiffness and drag values on this actuator, similar to what's possible with the Mini Cheetah clone actuator?"
great video!!!!... can you please explain a little bit about what is torque control mode and how you used it in this actuator.
I have the steadyWin actuator, i suppose you have to calibrate motor before it will move at all :-).
The red light comes up , but no movement
So if you can control the speed of the actuator you could probably slow it down before it stopped to reduce backlash.
Thank you for this video. It helps me a lot.
Please could you explain how information from the motor can be read on the Mac. Which program is needed for that?
It is shown on the video at 7 min 28 sec.
very good lesson. It is easy to undestand. Thank you
Thanks for bringing attention to these actuators. I bought one for a project. Do you have a video that details how to use the CAN bus?
Thanks!
Very interesting and useful.
Hi, Could you explain how to adjust PID values with that? For reference, I have a plan to develop SCARA arm (H: 68cm, L1: 30cm, L2:30cm) using use RMD X8 Pro.
Hi, it's a really nice actuator, thank's for share :D
Great review. I would like to know if this motor has an internal brake that can prevent it from turning when there is no power to the motor. Just like in an industrial robot where the robot arm segments stay in place when the robot is turned off.
Good video and explanation, you rock's, thx!
Thank you a lot!
@@Skyentific Than's for share your work with the best attitude!!!
may I know how to diy the CAN connect cable like you do?
Great content, I find your videos very informative, however could you look at the feasibility of using clearpath servo motors for robotic arm projects?
Здравствуйте. Подскажите пожалуйста сопротивление у обмоток этих моторов. Нужно попробовать их использовать с другими CAN контроллерами. Спасибо. Надеюсь найдете время померить. Хорошего дня!
I want to make a correction here " high voltage doesn't mean low current". In Robotics torque is more of an important factor than RPM. So 48V means it's designed to carry more current. I am expecting that 48V & 24A can generate around 24Nm effectively by using a 6:1 Gear ratio for your first motor.
The size of the motor limits the maximum power
Skyentific what will be if you increase torque it will corrupt actuator? for example if i want use actuator for milling wood plate i should use some reduction gear ?
Thank you for sharing！Very useful
Hi! we are experiencing difficulties trying to find a good way to home the actuator, it comes with an absolute encoder, but unfortunately it is not mounted on the output shaft, but on the motor shaft, so we can detect home in the 0-360 range of the motor shaft, however, we dont know on which of the 6 positions of the gearbox output it is on... not without adding an extra encoder, limit or home switch and a routine. Are there any similar motors out there that do have an output shaft encoder, or how do you recommend we go around this?
Thanks!
Hello.
Can you please described me the torque mode?
Do i understand correctly, that if i want to rotate a motor with constant speed, and constant torque, than my input via can is only :"direction, speed, desired torque"? Or desired torque is set only via config limiting current? Can i during motor operation change all these parameters?
Thank you very much
Excellent video and really both products are just beautifull !! Unfortunately a little expensive for me as a hobbyist...
Great review! Could I ask you if you have any idea about the backdrive reistance? With this I means what effort (Nm) is needed to manually drive the output shaft when the actuator is turned off. In my project it is very important that the device can be manually overrriden without adding too much resistance. Thank you in advance!
I am wondering how shock resistant the gear train is. For legged applications, you might overload the gears momentarily.
Hi, this is a really nice video. Thanks for uploading. I wonder if you have tested the peak current it takes to reach the 31+ Nm? Thanks again!
Thanks for sharing. Is it typical to include another gear with these actuators? Any harm in doing so?
I dont know if you have it or not, but you should make a page with projects etc...and a Discord channel.
Good luck!
Great video! It inspired me to buy the RMD-X8. Would it be possible for you to publish the code you wrote to test the actuator?
Where can you get drawings for these actuators?
Hi, thank you for sharing this video. I just bought one. Could you also share your Ardunio code you used for your demo? Thanks
Great channel...
Love your explaination and your details... i would lo e to build 7 dof to hold a industral router. Question have you ever looked at clear path servo motors?
Thank you. Theoretically, if you would like to make serial robot, clearpath servos are a little bit heavy for its torque. You would need to use a large reduction gearbox. Personally, I never used these servos.
@@Skyentific i was thinking of using a 5kw atc spindleon the end of the arm.... aprox 20kg....which means redesigning your fram i would..love to 3d print a mold of it..would require redesigned heavy duty supports and thicker bracing support and cast the peices from carbon fiber shell filled mineral cast expoxy....yes...much heavy industrial robotic arm..using clearpath servo and..harmonic gears...
Where can find a free 3d cad model of this or simular 7 dom arm
I m thinking of using those strong and cheap compaired to this , e-skateboards brushless motors along with odrive or FSESC that cost one fourth of this actuator for a robotic arm
I would love to make a 2 axis gimbal platform for a telescope/camera out of something like this for tracking terrestrial things like rocket launches and races. Do they provide any kind of measure of mechanical vibration in the drive? What is your subjective experience based on tinkering with them?
Hi, @Skyentific you recommend other actuator motor, this is out !
If you pay over $500 for an actuator, you should also look at the Robotis Dynamixel XM and Pro series.
Very interesting! they are not the cheapest thing on this earth but they seems good, maybe for the 7Axis new robot
!
Would a breakthrough in actuators accelerate the widespread use of robots?
Hi, I have a trouble with the CAN BUS conection; the Arduino code works but the motor don´t move; I probe the same code with other motor and works good. I think that the firmware is the trouble. So too probe it with the UART drive and works good, please HELP ME!!
Have you found a solution? I have the same problem...
@@clementd4984 I found the problem. The motor driver malfunction and it was replacement with other new. You have disoldering the internal wiring and put in the new driver with other soldering. Is a fabrication fail and GYEMS no gave me a guarantie. Very bad.
@@perezmiguel3877 Well, this sounds bad... 😐
Can you share your code fore the CAN communication? I tried several things (including thencode in this video) with a MCP2515 module and with a CAN shield from Keyestudio, and it doesn't work, but I'm not 100% sure that my code is correct. 🙏
@@perezmiguel3877 And thanks for the response, by the way! 👍
@E K the code is the same used in this video and works very well, review if you made correctly the CAN bus line and put the correct and put the correct dial code switch for the motor address
Can you buy a cheap version of that motor with the low torque and rewind it to make it higher torque yourself?
Most probably it would not work. The torque depends on magnetic flux. If you put more turns with thin wires, they will cary the same flux as thick wire with less turns. So it will change KV of the motor but not the torque.
good information, thank you
Well done.
Thanks a lot, very interesting!
Very cool! are there numbers available for inertia and friction? also I wonder how higher rpm operation is
Hi! Do we have a variant with 100Nm torque capabilities?
The best actuator (in terms of torque ) I've seen so far are these RDrive rozum.com/servomotors/#available with integrated CAN controller and 1:100 Harmonic drive... But at a price...The whole arm is 23k
I see lot of Servo motors (like ClearPath Servo) which gives good torque, speed and precision. And it is around 35$. But this actuators are 500$. So, im wondering how do these actuators make difference with those servos. This is just a question and im new to robotics. Please assist me so that I can design my robot - The Best.
I will be waiting for the answer. Love your videos. Thanks for making us to know the availability of different components. Keep going...
Thank you. The cheap servos usually not powerful enough for the robot arm (with at least 1kg payload and human like reach). Also this particular servos (ClearPath) are very heavy and not very powerful. That is why in robotics they usually use harmonic drive actuators or MIT mini cheetah like actuators. Harmonic drive actuators usually cost many thousands. Thus standard robot arm with 6 axis would cost at least 10-20 thousands.
Clearpath of the similar torque, cost 700USD, and weight 11kg!!! And this actuator weight less than a kilo.
Thank you soo much for the information. Actually im pretty new to robotics. So I thought servos are cheaper. Thanks for your information.
Also, Im wondering like, servos contains dc motor, gear reduction system and feedback system. Actuators that i saw in your video has same components. Then how can the weights of both vary this much? Servos - 11kg and Actuator < 1 kg? 😅😅😅😅
Do these motors have radial/axial/bending moment rating?\
Ай кам хиар ту си вэри интэрэстинг актуэйторз!
Акцент - это фишка. Пипл хавает.
Hi first of all very interesting videos keep the great work, secondly which D printer do you use for making your parts? thank you very much