Let’s list PLYUMP parts:
- Peristaltic gear
- Motor gear
- Shaft holders
- Rollers holder
- Tube lock (optional)
Printing parts design are stored HERE. Files are designed with OpenSCAD or SketchUp.
- 4 x M3 20mm screws + nuts + washers
- 4 x M3 10mm (motor)
- 5 x M4 40mm screws + nuts + washers
- M8 70mm + nut
- 4 x 608zz bearings
- 20 x 624zz bearings
- Nema 17
- Tube (Silicone 8mmOD, 4mmID)
- Insert the 608zz bearings inside of the shaft holders.
- Join the shaft holders to the body using M3 screws. The bearing side must be facing outwards.
- Place the motor, and lock it with four M3 nuts.
- Insert the motor gear into the motor shaft.
- YOU HAVE COMPLETE THE STATOR.
- Insert the 608zz bearing inside the peristaltic gear and another one inside the rollers holder.
- Screw the M4 through the peristaltic gear.
- In each screw add the next sequence: washer + 4x624zz bearings + washer.
- Close the rotor with the rollers holder and tighten the nuts.
- YOU HAVE COMPLETE THE ROTOR.
- Place the rotor on top of the stator and slide the M8 through the shaft holders and rotor bearings.
- Lock the M8 nut.
- Run the tube through the body hole over the rotor pass it through the other body tube aperture.
- Adjust properly the tube to have the desired amount of tube in both sides. One side must be long enough to reach the vessel where your pumping material is, and the other to reach any position of your head printer.
- Stretch the tube and place the cartridge on top. Tighten the M4 to lock the tube.
- NOW ITS DONE YOU HAVE YOUR PLYUMP READY TO PUMP!
I recommend to manually test it! With some water.
Depending on how you placed your motor you might need to readjust its position to have the proper position between gears.
The tube lock might not be mandatory if you feel the tube is not sliding through the pump. This is quite a sensitive topic. Professional pumps uses special locking systems to avoid the tube to slip due to the pump motion.
In previous versions, this was an ISSUE. For version 0.43 the hole where the tube goes through is small enough to keep the tube in place. But at the same time this makes it difficult to clean or swap.
One of the cool things of this design is that the cartridge is an independent part. This means it can be modified or replaced without needed to reprint the whole pump. This is a cool feature that was thought to speed up design and test some hardware pulsation techniques. Moreover allows to use different tubing diameters by just designing a new cartridge.
Selecting the right tubing is quite important, this depends on the liquid we want to pump. I found i nice silicone tube at a local store.
I recommend nozzles from 0.5 to 2mm. This is highly dependent in the fluids viscosity, the thicker fluid need bigger nozzles.
If you have access to them i recommend using pipette tips! they are great! Otherwise syringe tips work as well, but they are less “friendly”.
This is printer head-carriage dependent. Is the only file. I recommend to design yours specially fitting your printer requirements. A cool feature is using magnets to hold the tip, so its easily removable.
Another long post, for the next one we will discuss about slicing configuration.