IGUS Bearings - Prusa i3 mk3
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- Опубликовано: 14 фев 2018
- ** Rons Place **
I had installed IGUS bearings onto the y axis of my Prusa i3 mk3; take a look and see how it went.
IGUS Used:
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LMU88:
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Hey Ron. I installed these on my Anet A8 and they work great. I've been using them since July on both the X and Y axis. So far I've had great luck and the noise difference is night and day.
The Igus you showed need to be pressed into a pillow block to get the proper fit. It’s also best to use the aluminum rods that Igus makes for the polymer bearings.
Igus does make a bearing that cased in aluminum to the proper fit and are the same dimensions as the steel 8mm bearings.
Ron Hunt You’re welcome! I hope you find something that works. They do list them on their website but it’s in an odd place
They are the RJZM-02-08
www.igus.com/wpck/3661/drylin_r_rjum_02
Ron Hunt The H7 fit is a slip fit. The aluminum housing preloads them to internal spec. At least that’s what I was told by Igus. I used them in a Haribo mod Prusa for almost a year before they wore out. Also used the aluminum rods.
Ron Hunt I’m pretty sure that if you look at the page on Igus’ website the bearings you have it says “designed as a press fit” or something like that. The aluminum housed ones ask for an H7 housing which is a slip fit housing. They also work with the u-bolts. You just have to be crazy careful tightening them to not deform the aluminum.
Thanks for your video. I appreciate your LMU88 link. I think that I will stick with the LMU88 bearings for now.
Prusa Bearing are only lube for rust protect in shipping you must lube them with grease when you get them.
Have you tested your rods? Prusa said that some of the early shipped printers shipped with stainless steel rods instead of hardened steel rods. They are shipping replacement rods for free if you're affected.
Hey Ron,
I've been using original IGUS bushings on my Anet A8 rebuild, and the thing with them is that indeed there is a tolerance that can cause that some a little loose. Furthermore the fact that they are self lubricating means that some of the polymer dissolves to lubricate the bushing resulting in an even more loose fit.
I originally installed them on the X and Y axis of my printer to get the machine to be more quiet, but have since (using them for about 6 months) replaced the ones on the bed for the normal LM8UU bearings. The X axis i also wanted to replace, but having the alignment just right at the time made me not do it just yet. Although i'm seeing artifacts in my prints now and start to wonder if that is because the IGUS could be catching on a specific place on the rods. As the artifacts are always in the same spot of multiple prints.
As for the Prusa Mk3, i have one on order and am getting around March 5th. Was thinking of installing IGUS on that, but after experiencing this and now your video, i think i will stick with the normal bearings Prusa includes in the kit.
All in all seeing the price of the IGUS bushings is quite a bit more then standard LM8UU bearings, its unfortunate they wear out quite quickly.
I eventually got my MK3 and been printing a week. With the latest firmware I was getting layer shifts but after turning off the detection, no more shifting. Few people on the forums with the same result.
I used to have the same problem with the layer shifts, but i installed the latest firmware (released february the 5) and now it seems to work fine, i'll do some more test prints during the weekend though.
There is a Prusa forum topic about the bearings, you should read this. IGUS bearings work fine on IGUS aluminium rods when these are perfectly aligned which is quite hard with the u-bolts and printed y-rod holders. There are SFK bearings which seam to be better but they cost quite a bit
Wonder if you could get the rods dipped DLC "Diamond like coating"
Do look at Tom's video as you will see that the best option is to use matched rods as the fit is important. Generally it is an interference fit that takes some effort to achieve. For my money, use high quality ball bushings.
Have you seen Tom’s video ‘should you be using igus bushings’ I think you may have got a better result using the igus with the aluminium sleeve.
Ron Hunt yeah, watch the video, it explains why these don't fit well. It isn't because of the rods.
The best prices I can find on those are over $20 each! I came here after Tom's video to see how it goes with the non-sleeved ones. I was sure hoping it would be better than this! I guess I too will stick with balls for now. They sure have eaten gouges into one of my rods though! But I can replace rods and bearings enough to last me several years for the price of those caged igus.
For polymer bushes You need to use Slide Block Linear Motion.
I've got Igus bearing ATM on my x of my highly modified Anet A8 (they are held in with zipties). There is no play what so ever though they don't seem as free as when I put them in.
yes but the pressure on them is less due to the ziptie fastening and light weight Bowden.
The Anet layer shifted overnight in the x axis so they will be coming out again.
Darn. I should have watched this video before I bought the igus bearings. Good news is I haven't installed them yet. Like you I have a "grinding" noise with the standard bearings that came with the kit. I have used synthetic grease before assembly. I need to get a magnet and see if the rods are stainless or hardened steel. That could be the issue.
I have heard a few did ok with Igus.. I just didn't have good luck personally. I have a few ideas, but honestly once I replaced the bearings I haven't had any problems. You certainly want to ensure you have the the correct rods. Mine were.
yea, igus bearings need their accomping rods. On the bearings u got now, put some lithium or silicone lube on the rods and the should help the bearings roll nicer and quieter, and if u ever take them off again, put a little bit of lub in the bearing before putting back on. Misumi bearings are meant to be better, i think they are just longer lasting to the tolerance they are ment to be at, the cheap bearings just replace after a good amount of print time imo.
Igus weared out because of the marks on the rod left by prusa bearings. Igus works with new rods.
just wondering ; did you contact igus for advice? i would love to see a upgrade kit even if it has to include sleeves and new rods to match
the short life span and play would qualify in my opinion.
I currently use the Igus in my remodeled Mecreator 2. Here they do a great job, but here are also always 2 linear bearings in a line.
I think that's the point. the 3 bearings in prusas y axis just leave too many possibilities for the bed to twist.
Igus is not ideal for every application.
did you use igus bearings with igus rods ?
Igus bearings need no lubrication. You have to clean the rods with IPA or something similar prior to the installation. Lubrication will cause premature wear and failure.
My bearings are LOUD and are as loud as my anet a8 ....
replace the bearings replace the rod. Ive replaced the top rail and bearings with the new self lubrication kind and all the problems i had are now gone.
it wiggle I change to the IKO bearing work much better
I was in the group that got the wrong rods, and when I got the new rods and bearings, I tried it with some igus bearing I had hanging about. I found the hoop fixing it compressed the plastic making them not run free enough. Misumi bearings are supposed to be really good.
drive.google.com/file/d/1iS13nv_gKguMspX6nzi5QXwhptg4zPMN/view?usp=sharing
you could possibly make an stl that hold's the bearings in without putting too much pressure on the plastic, instead of the hoop.
What exactly did you do? My MK3 will arrive in some weeks and I planned to install the 01 Igus plastic bushings. I just want the best and the most quite bushing possible. Did you print out some other mount or how do you use the bearings?
you will need something like this www.thingiverse.com/thing:1848700 though these are for the Mk2 and probably won't quite be right.