The 11202 arm is good for reaching tight places, but 1/4" Scotch-Brite belts can be unstable, especially when new. This guide constrains the belt on one side, so that there is a much wider stable range of tracking adjustment than what the contact wheel alone supports, and the belt is less likely to slip off when side loaded. Not compatible with 1/2" belts. 1/4" sandpaper belts do not need stabilization, and should not be allowed to touch the guide, though the guide can remain in place when using them.
Uses a 3/8" washer (13/32" ID x 7/8" OD x 0.050"). Orient the washer so that the smooth side contacts the belt. Install the washer by hooking one side on the hook nearer the contact wheel when installed, then pushing it down on the other hook while bending the guide to close the gap between the hooks. Print with a 0.4mm nozzle and 0.2mm height for all layers. Print solid with perimeters only. Arachne perimeter generation recommended, set so that 0.8mm-thick walls resolve as two 0.4mm extrusions. Slice gap closing radius should be less than 0.05mm since there are important 0.1mm gaps. Use a stiff, heat-resistant material such as fiber-reinforced polycarbonate. There is a modeled support for the clip. Break it off before installing the guide. No slicer supports are needed. If using a bedslinger, orient the model so that the long axis is aligned with bed movement. If printing multiple guides at once, set each to print sequentially rather than in parallel, since the clip needs good layer bonding.
The author marked this model as their own original creation.