Tension screw trap for MMU2S

thingiverse

Sometimes, when I open my MMU2S, the two tensioner screws and springs fall out. The screws are easy to find again because they don't go far. But the springs, oh, the springs! They want to roll away as far as possible toward the least accessible place behind my desk! One is now completely lost. I'm now using my last spare spring, so I needed a solution. I wanted something more robust than [retention washers](https://www.thingiverse.com/thing:3649081) and simpler than [reprinting the entire idler body](https://www.printables.com/model/124431). [Blindside_o0's excellent V2 design on Printables](https://www.printables.com/model/68165) meets my requirements. This remix is reverse-engineered from scratch in OpenSCAD. This design includes wider side viewing openings as well as new openings in front. It is important for me to know where the screw heads are — mine need to be flush with the top of the MMU cover for proper tension — but my printer is situated so that I cannot easily look into the side holes. I need to look in from the front. In this redesign, I made the existing side holes larger and cut additional viewing holes in the front, so that I can more easily see if the top of the screw head is flush with the top of the MMU body.