Grooved Pulley with mount

I designed the holder to be used with this pulley: https://www.thingiverse.com/thing:2662199

The pulley uses 2x MR115 bearings. I used a 5mm aluminium rod as axis / pins for the pulley.
I added two washers with 1.5mm thickness for each holder, so the pulley sits snug in the holder and does not create friction with it.