Prusa i3 Y Axis Bearing and Belt Brackets

thingiverse

I'm working on revising my Y axis setup. The Y Axis belt isn't staying in a straight line throughout its entire movement, and that's got to change. I'm hoping these adjustments will keep the belt clamp part of the bracket level with the top edge of the T20 pulley on my NEMA17 stepper, ensuring even tension across the full range of Y axis travel. Right now, there's increased tension at each end of the movement, which puts extra stress on the stepper and could even warp the bed support plate, affecting the bed level. Please note that my bearing brackets are 30mm apart (others use 20mm, but mine is different, so double-check yours). If you like this design and want it in 20mm, let me know and I'll export a modified version. This design suits LM8UU bearings. To ensure the Y axis bearing bracket holds up, print it in the orientation shown here. Otherwise, it will split between layers when trying to fit the bearing. The one shown was printed with a 0.4mm nozzle in ABS at 25% infill (I'll probably do a full set at 100% infill next time). Print settings were 70mm/sec and a nozzle temperature of 220°C, bed temperature at 100°C. As for the Y-axis belt bracket, I haven't printed it yet, but I don't see any issues on the horizon.