*** Update 200521: please check out the remix by Peppered: https://www.thingiverse.com/thing:4377939 - it's awesome! *** *** Updated 181214: Added stl for Nema 17 stepper. *** *** Updated 180319: Added files for lower Z guide supports and the filament guide. ***
** Note: M@rkd0wn works whenever it wants to. Sometimes it looks ok, other times random text is bold and in a larger/other font. I can't control this. **
This design accomplishes three things:
* Keeps the Z-axis screws in sync
* Increases available torque (and speed, depending on chosen motor)
* Provides an easy upgrade path to proper lead screws, especially for the common T8x8
It is designed for the Geeetch i3 Pro B, but I suspect it will fit others as well.
There are three required prints and a few optional. The required ones are the left and right top z mounts and a brace for the two belt idlers. Optional: filament guide and lower supports for the z axis linear guides.
Things you'll need apart from the printed parts:
1 Bipolar stepper motor - Nema 17 or Nema 23. 1 GT2 852 mm belt, about $2 on [ebay](https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=gt2+852&_sacat=0). 1 GT2 20t pulley for motor. 2 GT2 60t pulley with 8 mm ID for lead screws. 2 GT2 ball bearing idlers with 5 mm ID. I didn't have that, so I used ball raced pulleys. 2 T8 lead screws, 300-400 mm. 350 mm is ideal. 2-4 608 bearings (OD22/ID8/H7) 2 M5x30-35 screws 3 M3x12 screws Perhaps some other screws, nuts and washers.
Optional: 1 M8 threaded rod, minimum 330 mm (used for extra bracing). 4 M8 nuts and washers.
Don't be afraid of the amount of text, this is a really simple upgrade.