Oct 28, 2017 · Reprap: Prusa i3 Build – Part 5 Following a little testing I now know for sure that the motor driver on the Z Axis is a dud, I tested both motors on another driver and they worked fine so I swapped the extruder driver with the dud so I can continue calibrating the printer while I wait with hope for the new driver to arrive. The Prusa i3 ION uses a MK8 drive gear wheel to feed the filament into the extruder. The wheel is fixed on an axis with a gear on one end which increases by factor five the power that is transmitted by the motor. This way we can use a smaller motor in the extruder, reducing the motor’s inertia and increasing printing quality at the same time. After cracking a few sheets of normal glass from rapidly cooling or heating, borosilicate glass will quell your frustrations. NOTE： NOT fit for Ender 3 because 220*220mm is the build size of Ender 3, the actual heatbed size of Ender 3 is 235*235mm. Features: * Borosilicate is a very high-temperature glass. It has a melt temperature of about ... If you want to make your printing platform flat enough, ideal stuff is glass sheet. Tempered Silicon glass is rated for higher temperatures than normal sheet glass making it a better material for use as a heated bed. After cracking a few sheets of normal glass from rapidly cooling or heating, tempered glass will quell your frustrations.