Prusa (Bear) MK3 / MK2S / MK2.5 Y-Axis Belt Holder and Tensioner by Stefan M.

Beschreibung

Work in progress - see changelog at the end of this description After playing around for my upcoming linear rail mod for the Prusa MK3 Bear Upgrade I needed a new belt holder for the y axis because of different distances from the belt to the idler and bed. And I also was looking for a nice tensioner for the y-belt which doesn't shift the axis of a bearing or de-parallel-ises the belts or brings some torsion in - with no luck. So I designed one myself and made it way stronger than the original one, perfectly aligned to the original Prusa idler and pulley design with a tensioning along the belt. For MK2S/MK2.5:After getting reports about the tension screw of the former MK2 Version hits the pulley on the motor I redesigned the parts for those printers. As I don't have a MK2 I had to test it in a CAD model which seems to be fine now and the holder triggers the end-switch before hitting the pulley. The belt path changed because of the less space in the MK2 version. The sledge and the screw are now completely in the block I made the sledge way a little wider (0.1mm) to counter the overhangs there. Please make sure that the belt is on the sledge like shown in the picture with the red circle to maximise it's grip. This Thing is a 3-parts design: Prusa_XXX_y-belt_Cover Prusa_XXX_y-belt_Block Prusa_XXX_y-belt_Sledge The _Cover is to prevent the belt skipping out of the teethed slots (6.2mm wide) and in the MK3-version also for the protecting the sledge it makes the whole thing even…