Delta-Pi redesigned top clamp and idler assembly with tensioner

thingiverse

The Omega-Mi motor mounts enable users to effortlessly adjust the stepper's position vertically by a few millimeters, thus adjusting GT2 belt tension accordingly. Nevertheless, this setup is impractical due to steppers being mounted beneath the base of the printer. Recently, I've been pondering this challenge for several weeks and started drafting OpenSCAD code last week to devise a more practical system to adjust GT2 belt tension on each column by means of an auxiliary assembly placed atop the printer. Adjusting belt tension is now a simple matter of turning a knurled knob. This creation can be easily retrofitted to any Omega-Mi, and I plan to incorporate it into my modified Omega-Mi, which is still in the assembly phase. The OpenSCAD source files are available for further remixing. Update: New OpenSCAD file included, featuring options for either a simple microswitch or Makerbot-style mechanical endstop for the top clamp. The idler assembly requires one M3 20mm screw, two M3 washers, an M3 nyloc nut, three M6 nuts, and one M6 50mm hex screw. This design leverages parts from my previous designs: a knurled knob for M6 nut and GT2 belt pulleys using 623zz bearings. Please consult the instructions in their respective pages to print these components properly. For optimal results, I recommend printing all parts at 35% infill in PLA or stronger materials. However, idler lids and tensioners should be printed with a minimum of 50% infill to ensure reliable performance under tension.