A minimalistic peristaltic pump that is designed for NEMA-17 stepper motors.
Peristaltic pumps allow for precise fluid control and handling of corrosive liquids.
Step 1: The Parts
The parts you need consist of M3 screws and two 3D printed parts (under one hour of print time). You'll also need a hex key.
Step 2: Attach the Bearings
In the order shown, screw the bearings into the hub. Be careful not to snap off the spring arms but also apply pressure to ensure that the screw taps threads into the plastic.
Step 3: Set Screw
Insert the set screw partially. You will need room for the motor axle later.
Step 4: Thread the Tubing
Thread the silicon tubing into the hub. Tweezers or small needlenose pliers help.
Attach the clamp by stretching the silicon tubing and sliding the clamp on. It should be on the left side as shown when the hub is flat on the table and the holes are as high as possible from the table (see picture).
Step 5: Align the Parts
Drop the hub roughly in place while leaving extra tubing out. Then push the bearing roller onto the axle. Slowly turn the bearing roller while pulling the unclamped side so that the tube is caught by the flanged bearings and held in place. After half a turn, the tube should be aligned.
Step 6: Attach the Hub to the Motor
Screw in the two longer screws. This is where you can change the orientation of the tubes in relation to your motor wires.