Building a unipolar 3D printer part 7 | X-carriage and glass build plate!!

For an easier prototyping time than Brian had, check out: www.pcbway.com/ to get lower prices on boards with 4-6 layers!
It's finally time to build the X-carriage for my unipolar 3D printer!! Since the stepper motor gear assembly is an integral part of the X-carriage design I had to do it all at the same time as the linear motion system for it to make any sense. I also got started on the heated bed which will be made using the scanner glass I salvaged from a broken inkjet printer. Since I had to get rid of the aluminum heat spreader plate to stay within budget I needed to mount the bed leveling screws on the glass directly, which somehow resulted in successfully drilling holes in glass without breaking it... making a low-cost DIY bed heater to heat that pane of glass to over 100°C turned out to be quite a challenge though - a challenge I wasn't able to complete within the short time I had left to finish this video, so stay tuned to see what I come up with!
Here's the test code I used:
Bidirectional speed control potentiometer: rb.gy/dmh8rg
And some affiliate links* to parts I got for this printer:
5pcs A4988 stepper motor drivers: s.click.aliexp...
Cheapy hotend kit: s.click.aliexp...
Arduino mega 2560: s.click.aliexp...
Geeetech PLA filament: s.click.aliexp...
4010 turbine fan: s.click.aliexp...
100k NTC temperature sensor for heated bed: s.click.aliexp...
10m nylon coated fishing line: s.click.aliexp...
Keep in mind I got a few of these items during sale, so the total might well be above $50 now (especially with inflation)
if you decide to purchase something through an affiliate link I receive a small commission
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