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

Last crawled date: 3 years ago

This is a simple mount for attaching to a 2020 or 2040 v-slot rail, to hold a single 5mm bore idler pulley. I needed this for my installation of a 3-leadscrew Z axis system on my D-bot.
It's useful to help take up the slack if a belt is a little longer than needed, or to change the direction of the belt, or whatever.
A much smaller and more compact mount could be designed to hold a single 5mm bore pulley, but I just 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 typically 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 then 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 you can either fulfill 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'd recommend it be printed solid, since this pulley may be under considerable sideways strain if it's being used to take up slack in a fairly tight belt.