Summary

I couldn't quite find a belt tensioner i liked that didn't rquire dissasembly so i made one I also included the cad files

Instructions

used all sae parts easily found a lowes in the hardware aisle in the green machine screw boxes of hundred.

1 x 6-32 X 1-1/4"
1 x 6-32 machine nut - this i important to get the box of hundred with green label as these nuts are half the size of the ones in the bins

2 x 6-32 1/4"
1 x 608 skate bearing- found at any skate shop, usually also a ski or snow board shop

print one of each and assemble

loosen the nuts on the idler bearing slide between the fender washers and nuts(mine isn't beacuse i didn't have a belt guide at the time and liked a little play as it didnt bind) re-tighten nuts and tighten belt to liking

Prusa i2 Y Axis belt tensioner - No disassembly required