Voron M4 90T Gear for 200mm Belt

Assembly

This part is assembled the same as the stock Voron M4 extruder, so the same installation steps can be followed. The belt is a bit tight to get on, but if you put the belt over both pulleys and slide them both on at the same time, it becomes a bit easier.

Extruder Tuning

Here's a good guide for printer extrusion tuning: Ellis' Print Tuning Guide

If you are using Klipper, you can set rotation_distance under [extruder] to the following equation: stepper degrees (200 for 1.8, 400 for 0.9) * microsteps / steps per mm

ex. 200 * 16 / 627.5 = ~5.1 I found that ~627.5 worked for me, so I would start around 630 and adjust from there

Edits

Edit 6/26/25: Removed the counter-bore that made the GT2 pulley sit too far inward, this also removed the need for the 5 m3x8 button head screws.

Edit 5/25/25: Reduced total width by 1mm and reduced belt retention flange diameter by 2mm to reduce rubbing

This project was created with OnShape!

https://cad.onshape.com/documents/e390f69fdf4d817c602db322/w/b558496c0789d7138cdfcbb4/e/43226861fa43da6ea192b698?renderMode=0&uiState=6771603918cbdd7fb28bf691