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 is capable of printing itself and that is almost completely printed. The basic version has a total hardware/vitamin count of one!! (the print bed). Only one nema is used for the Z axis and so the electronic parts are also reduced. The full parts list for the basic printer is: 1x 220mmx220mmx3mm sheet of glass or phenolic board (phenolic for printing nylon). 4x Nema17 motors with wiring (40mm long fit the std clamps but the scads are added so the clamps can be modified to fit other nema17 motors). 3x Mechanical endstop switches with wiring. 1x Motherboard (I use the MKS Gen L). 1x Hotend (I use a J7 which comes complete including a fan, bowden tube and wiring). 1x 150w 12v Power Supply. Everything else is printed (and I do mean everything else!!). You can add a Heated Bed, LCD/SD Card and a nylon capable Extruder: 1x 220x220 Heated bed with wiring (I use the Anycubic Ultrabase). 4x Springs for the above. 1x LCD 2004 with SD Card reader (my favourite screen). An alternative extruder (essential for using nylon) needs: 1x Brass knurled gear. 1x U604 bearing. Everything else is printed (and I do mean everything else!!). The basic version is aimed at being almost completely printable and it works amazingly well. The print quality is high and it is capable of making a working version of itself. The ReprapMJ has a build volume of 200mm on X axis, 210mm on Y axis and 170mm on the Z. It is very neat and tidy with a small footprint. Rack and pinions are used for all axis. With no belts, the maintenance and setup is more convenient and easy. The Z axis uses only 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 to use a computer or control interface. The build plate assembly can very simply 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 is a version of the J7 available which is rated to 300 degrees if needed. There is a fully printed extruder which works well with PLA. However it does not grip Nylon sufficiently well and so an optional extruder can be used which needs two hardware parts. There is a document attached which includes 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 have used an Ender3pro, a TronxyX3 and earlier versions of ReprapMJ and they all gave consistent results. However, it is likely some printers will differ and some fine tuning of print settings may be necessary. I will be grateful for any feedback and comments.