idler pulley mount for M5 bolt hole, mounts on 2020 or larger v-slot

thingiverse

This is a basic mount for attaching to a 2020 or 2040 V-slot rail, designed to hold a single 5mm bore idler pulley. I created this mount for my installation of a 3-leadscrew Z axis system on my D-bot. It's helpful in taking up slack if a belt is slightly longer than needed, changing the direction of the belt, or whatever else you need it for. A smaller and more compact mount could be designed to hold a single 5mm bore pulley, but I started with the Z axis bearing mount assembly that I'd remixed as part of my bearing assembly for 3 leadscrew setups. The following thing has a photo that includes this bearing mount as part of my installed 3-leadscrew Z axis: https://www.thingiverse.com/thing:2401504 The Z axis bearing mount in that thing is a remix of the original Z axis stepper motor mount. I usually include sources in my things, but in this case, I don't have any sources. I edited the original D-bot stepper mount in Tinkercad to produce the version I used in my 3-screw bearing assemblies. For this 5mm bore pulley mount, I simply filled in the hole that held the flanged bearing, filled in the screw holes, and added a single 5mm diameter hole in the center of the mount surface. In my case, a single M5 washer and a 7mm high aluminum spacer raised the pulley up to the same height as my other geared pulleys used in the 3-leadscrew Z axis system. Whatever spacing you need can be fulfilled by finding an appropriate spacer, stack of washers, printed spacer, or whatever. I printed this in PETG at 260/70 C with a .4mm nozzle onto PEI. I used 98% infill to make it nice and solid. You can print this with whatever settings work with whatever filament you choose on your printer, but I recommend printing it solid since this pulley may be under considerable sideways strain if it's being used to take up slack in a fairly tight belt.