Resyringe - Retract, Refill, High-Torque Compact Direct-Drive

pinshape

Summary First version is up! Models featuring mounts for lukie80's Quick Fit system have been uploaded. Still working on a mount for RichRap's system. Real-world images will be posted once the machine is running to print the parts. Post-Printing Hardware: 2 x 608zz skate bearings 7 x 8mm M3 screws 7 x M3 nuts 1 x M5 screw, 10mm-25mm 1 x M8 nut 1 x M8 threaded rod or long screw Stepper motor Syringe (10mL centre slip) Support removal: Built-in supports in the current models handle overhangs. They should be only 1-2 walls thick; cut them with a hobby knife if they are stubborn. How I Designed This: When considering future possibilities of building a paste printer, it became clear that other paste extruders didn't quite fit my needs. Easy-to-clean direct-drive syringe-based designs capable of thicker material and retraction were in demand. The only options found were either too weak, unable to retract, or Bowden-style. To address these limitations, I came up with some ideas but soon saw their flaws. Then, a breakthrough occurred by thinking about doing the opposite of a lead screw: turning the nut to move the screw. This led to printing a new plunger with built-in threads and mating it to a printed gear. Further investigation revealed that an M8 rod was available. A crucial realization followed: some way to transfer the motion of a stepper to the nut on the thread was needed. A worm gear would put it in the best possible position, and a hyperbolic gear now used in the design came to mind shortly after. Custom Section: TODO: Fix non-manifold file(s) Design assemblies for quick change mounts Design top assembly with endstop mount Obtain and test with Luer Lock syringes