Peristaltic Pump

This is a complete re-engineering of the excellent design of Ralf's Perstaltic pump. I printed his pump and built it to his specs, but I found that the small stepper motors would not really run the pump consistently or with enough power.I decided to redraw everything from scratch to accept a Nema 17 stepper. This gives the pump PLENTY of power to push whatever liquid that you're trying to push. I had to beef up the bearing holders a bit. I also added some mounts. There's a single pump mount and a 4 pump mount. (I'm using to add fertilizers to my aquarium, so I use the 4 pump version). There are countersunk holes in the pump base to mount the motor. If you don't use the motor mount, I've included a spacer to use in it's place.The washer goes in-between the bearing and the bearing holder assembly on both sides. You can also use metal washers, but I found you can adjust the printed ones for a perfect fit.For the bearing mounts, use an infill of at least 50% - Y