Filament Pulley for Prusa mk3

It's ridiculously overbuilt, but this is the design I threw together to reroute the filament feed so that I could print directly from my dryer to the side of the printer. I designed it around the spool holder on my MK3S+, I'm not sure which other models have the same spool holder, but it seems like the MK4/S might work with it?

Hardware required: 2x 608 bearings, 8x M3x25 machine screws, 8x M3 nuts

I printed it with my standard prototype settings at 0.2 layers, 3 walls, and 15% infill, it shouldn't matter too much as long as it's reasonably solid. I did not use supports, but you can if you mind the dangly bits of plastic inside the screw holes. 

Assembly is straightforward: stick the axle through the pulley and pulley flap, making sure the round nubbin on the flap is facing outwards, and that the same round spacer on the axle is on the opposite side of the pulley. Put the two bearings on the ends of the axle, and drop the entire pulley assembly into place on side1 of the clamshell. The holes for the nuts on side2 may be a bit tight, so you may need to pull them in with the screws before finally screwing the two sides together, sandwiching the pulley assembly in the middle. I recommend screwing in the two screws on the tall, pulley side of the contraption first, then flexing the other side around the spool holder's beam to get it set in place, and then finally locking down the rest of the screws. This keeps the pulley assembly contained while you work so you don't have to keep holding it. The part should be mounted to the top two rectangular segments on the spool holder's diagonal beam. 

STLs are already pre-oriented for printing, with .step and .f3d files as well if you wish to reference or remix it. I also threw in an untested model for a version with an extra roller on top (that also requires two more bearings), but it's probably unnecessary.