Raiscube Y-belt tensioner

thingiverse

UPDATE: It's better to use this Y-tensioner instead. After using this design for a while, I noticed two things: 1. The arm is pulled downward by the belt when tensioned, creating uneven force between the frame and the four arms going through it. 2. Because of (1), the printed bolt becomes loose with each print due to reduced contact area caused by the angled position of the bolt when pressing against the front frame. Enlarged the idler holder bolt's slot from CH35C0's belt tensioner to fit Raiscube's original Y-axis bolt, which is M6 in size. The bolt and plate have very small tolerances, so you should scale down the bolt by 1% if you're not confident in your printer's precision. Print your bolt on its side with support. This way it will be able to withstand strong forces with just 10-20% infill.