belt retainer

thingiverse

Human: It's time to assemble one of these things that hold the Y-axis belt for Prusa Mendel. This device is designed with a low profile and won't bend the belt. Custom Section Instructions Print the base part, and the slider either for T5 or T2.5. I've only tested the T2.5 live, but it's probably the most challenging. As its name implies, the slider should slide freely within the base. It can be sanded to fit perfectly. Pass a 20mm M3 bolt through the hole in the end of the base and screw a nut onto it. This might require some patience, but it's not too difficult. Only screw the bolt into the width of the nut, then pull it back until the nut is securely trapped by the nut trap. Then attach the base to the lower plate at the end. Pass the belt through the attachment point and lay it in the slider. Make sure the dimple on the slider is facing the bolt because it has extra plastic to handle pressure. Draw the slider back into the base as far as it will go, then attach the other end of the belt with standard components. Pull the belt snugly tight around the idler and drive gear. The photos should show the assembly sequence (except for when it's not bolted down). You can tighten the bolt to achieve more tension. A hex head bolt is best because you can use a ball driver and get some wiggle room if needed, out from under the belt.