Improved Prusa MMU2 spool holder roller

thingiverse

Update 20 Aug 2019: Measurements Updated This remix combines two great ideas to enhance the spool holders that come with the MMU2s. Firstly, a clamp is used to hold down the bearings. Secondly, a PVC tube is utilized to create a larger roller and significantly reduce friction. The first idea was already implemented when I encountered issues with friction. Subsequently, I discovered the second concept. However, the PVC tube available in the US does not fit my European requirements. Furthermore, my spools are approximately 90mm in diameter, whereas this design accommodates up to 85mm only. To address these challenges, I combined both ideas and created 90mm rollers from 32mm PVC tubing (grey version, thick wall). These rollers are secured using a clamp to prevent them from falling out. A TODO task remains: the filament guide needs to be elevated so that it does not touch the rollers. For the roller, a 90mm long piece of grey PVC tube with an inner diameter of approximately 25.5mm (white tubes have a larger inner diameter) is used. If the roller does not roll freely once installed, it may need to be made smaller. The bearing_holder requires supports during printing but can be easily removed. A brim is necessary for the axis_buffer to print properly.