ReprapMJ 3D Printed “Prusa Style” Nylon Capable and Easy to Use 3D Printer with Full 200mm Build Size but Small Footprint reprapmj

thingiverse

ReprapMJ is a true reprap that can print itself almost completely. The basic version has just one hardware part count - the print bed. One NEMA motor is used for the Z axis, so electronic parts are reduced too. Here's the basic printer's parts list: 1 220mmx220mmx3mm sheet of glass or phenolic board (phenolic for printing nylon). 4 NEMA17 motors with wiring (40mm long fit standard clamps but scads are added to modify clamps for other NEMA17 motors). 3 Mechanical endstop switches with wiring. 1 Motherboard (I use the MKS Gen L). 1 Hotend (I use a J7 which comes complete including a fan, bowden tube and wiring). 1 150w 12v Power Supply. Everything else is printed - and I mean everything else! You can add a Heated Bed, LCD/SD Card and a nylon capable Extruder: 1 220x220 Heated bed with wiring (I use the Anycubic Ultrabase). 4 Springs for the above. 1 LCD 2004 with SD Card reader (my favourite screen). An alternative extruder needs: 1 Brass knurled gear. 1 U604 bearing. Everything else is printed - and I mean everything else! The basic version works amazingly well, aiming to be almost completely printable. Print quality is high and it can make a working version of itself. ReprapMJ has a build volume of 200mm on the X axis, 210mm on Y, and 170mm on Z. It's very neat with a small footprint. Rack and pinions are used for all axes. With no belts, maintenance is more convenient and easy. The Z axis uses one NEMA motor and a PLA printed counter balance spring to carry the weight of the X carriage. The X carriage can be raised and lowered by hand without needing a computer or control interface. The build plate assembly can easily be removed and swapped for a different bed (I typically swap between a heated Ultrabase for PLA, ABS, PETG etc etc and a non-heated plain sheet of Phenolic board for Nylon). The standard J7 hotend works with nylons such as Taulman Bridge or Alloy 910 but there's a version available which is rated to 300 degrees if needed. There's a fully printed extruder that works well with PLA. However, it doesn't grip nylon sufficiently and an optional extruder can be used which needs two hardware parts. A document is attached including a copy of the text along with a full list of parts and some assembly instructions. They are brief at the moment but I will update them when I have time. So far, I am the only person who has printed a ReprapMJ. I've used an Ender3pro, a TronxyX3 and earlier versions of ReprapMJ, all giving consistent results. However, some printers may differ and fine tuning of print settings might be necessary. I'll appreciate any feedback and comments.