H-CUBE - HBOT/COREXY DIY PRINTER - BUILDLOG

thingiverse

Hey there! My idea is to create a DIY testbed that won't break the bank, outperform Chinese-made versions, and be super easy to modify. The plan is to build a compact Hbot printer (350x350x350mm + overhangs) that can be converted to CoreXY with just two bracket swaps, some added idlers, and an extra belt. The Z-axis platform should accommodate popular heatbeds like the Mk2b or Creality Ender 3 heatbed, featuring two steppers and four linear shafts with the option to switch to two linear rails (requiring a shaft swap for 20x20 vslot extrusions). Z height adjustment will come from varying extrusion lengths + longer linear shafts and screws. The hotend mounting plate should work seamlessly with DD (BMG+e3v v6 clones) or bowden (Creality-like, Micro Swiss) setups. X and Y axes will utilize 300mm linear rails for stability. Accuracy is the top priority over speed. To minimize machining time, I'm designing the frame so that top and bottom plates, Z platform, steppers, and idler brackets can be cut from two 5x350x350mm Al alloy plates using waterjet or CNC routing (no bending required). I'll use 20x40mm extrusions and ensure all ends are parallel with equal lengths. For electronics, I'm planning to use the SKR v1.4 board + TMC2209 (sensorless homing) + BLTouch + spare parts lying around (24v PSU, old mk2B heatbed). Feel free to share your thoughts and ideas - it's still early days for this project! Cheers! Sorry about that STL file; I'm not posting it without it. This project is mostly about the frame concept, with all other components being standard parts like NEMA17 steppers, TR8 screws, vslot extrusions, GT2 pulleys, etc. I won't publish the design until the first prototype is made to verify its usability.