CeXY H-Bot MK2

thingiverse

*UPDATE* I've thoroughly tested my design of a bowden extruder and it's working flawlessly https://www.thingiverse.com/thing:3606182 I added parts that utilize 5mm threaded rod for the Z axis https://www.thingiverse.com/thing:3606182 A fan mount was added for a Volcano hotend https://www.thingiverse.com/thing:3606182 The frustrating moire effect (salmon skin) in prints is now gone; I tested the mechanics, drivers, electronics, firmware, slicer-settings, but it turned out that the motors were causing the problem, they ran too rough - too high inductance?? --> pic "no more salmon skin" After printing quickly with a 0.4mm nozzle, I tried a 0.2mm nozzle and printed the treefrog at 25% scale --> pics https://www.thingiverse.com/thing:18479 The 1:3 gear ratio of the Drakon Extruder was a bit too low for printing fast or accurately; right now I'm testing two ~ 1:5 geared bowden extruders (Wade-style) and they both work better https://www.thingiverse.com/thing:566791 https://www.thingiverse.com/thing:2639171 *********************************************************************************************************** "CeXY H-Bot MK2" is the updated version of my prototype https://www.thingiverse.com/thing:3080955 I revised most of the parts, added a BOM and a simple building instruction (aka foto story); the machine runs great; I printed a Benchy at 1:24 scale with 0.15 layer height and it turned out in really good quality (relative to speed) --> watch the pics! The goal remains the same - design a solid 3D-printer using standard parts, easy to build, use and maintain but not too expensive It's built with 2020 aluminium extrusions, NEMA17 motors, 8mm steel rods, LM8UU bearings, 8mm lead screws (l=300mm), a 200x200 heat bed, small endstop switches, 2 5015 radial fans and an E3D_V6 Hotend The parts are printable without support and have tolerances between 0.1 - 0.2 mm; they're designed for M5x8 cylinder head screws (frame); I printed them with 5 outlines and 4 bottom and top layers I used the Drakon Extruder but there are plenty of good bowden extruders on Thingiverse The electronics board was changed to a MKS Robin with DRV8825, and it prints much cleaner than the MKS GEN_L; I haven't tested it with a standard RAMPS yet Dimensions Frame - 2020 extrusion: 4x 355mm (X) 4x 340mm (Y) 4x 404mm (Z) Dimensions Bed-Frame - 2020 extrusion: 2x 315mm (X) 2x 189mm (Y) Dimensions 8mm Rods: 2x 305mm (X) 2x 295mm (Y) 4x 348mm (Z) The BOM doesn't include parts for the extruder and electronics mount; some small parts may be missing The building instruction isn't perfect, but you'll get an idea of how to assemble the machine Some parts (GT2 belt, screws, springs, teflon tube, cables) are missing in the renderings Fusion-Files are added I'd love to hear about your experiences! Happy Printing!