hello
I'll throw out that pulley cover and just use the 608 bears, on an prusa i3 dont they use 623? am wondering that because it looks like an i3 pulley system. " it maybe worth posting in the prusa i3 section, from the video those belt tensioner look like they get close to bearing idler, I move them under the bed when it centred. then I look at the motor pulley looking for a loose grub screw.