Improved Prusa MMU2 spool holder roller

prusaprinters

<p>This is a remix of two great ideas to improve the spool holders that come with the mmu2(s)</p> <p><a href="https://www.prusaprinters.org/prints/2073-prusa-spool-mmu2-holder-upgrade-bearings">https://www.prusaprinters.org/prints/2073-prusa-spool-mmu2-holder-upgrade-bearings</a><br/> <a href="https://www.thingiverse.com/thing:3113520">https://www.thingiverse.com/thing:3113520</a></p> <p>First is a clamp to hold down the bearings.<br/> Second is to use an PVC tube to make a larger roller and greatly reduce friction.</p> <p>I already used the first Thing when i found i had problems with friction. Then i found the second Thing. But the PVC tube is U.S. size, i live in Europe. And also i have spools of almost 90mm, and this only takes upto 85mm.</p> <p>So i combined the ideas and created 90mm rollers out of 32mm PVC tubing (grey version, thick wall) which are clamped so they don't fall out.</p> <p>TODO: filament guide. This needs to be higher so that the filament is not touching the rollers</p> <p>For the roller i used a piece of 90mm long grey PVC tube with a diameter 32mm (inner diam approx. 25.5mm, white tubes have a larger inner diameter), if the roller is not rolling freely once installed, you need to make it smaller.</p> <p>The bearing_holder needs supports to print, but i found is was easy to remove it.<br/> The axis_buffer needs a brim to print.</p> <h3>Print instructions</h3><p>0.2mm layer</p> <p>The bearing_holder needs supports to print, but i found is was easy to remove it.<br/> The axis_buffer needs a brim to print.</p>