crossbow_r0

It is an XXYY cross-gantry 3d printer.

The first prototype got 3:21 speedboatrace score, and the 5th(by score), 3rd(by machine/ID), 1st(all machines with direct drive extruders) on the rank list.

• speedboatrace video:
  • https://youtu.be/H7nYXnaKUYE
• speedboatrace leaderboard (ember_cc#3959):
  • https://docs.google.com/spreadsheets/d/1lFiJi-X3Xm3hh3I9Ty9dfACMiBWxHFAOUeiU1km9m6I/edit#gid=106736391

The final design is underway.

Main Feature

• XY system
  • Frame size 300x300
  • Full movement range (always larger than heated bed size): 170x170.
    • An aluminum heated bed of 150x150 or 180x180 is recommended.
  • nema14 55mm or 60mm stepper x4 (voron v0 xy stepper)
  • Designed from sketch and aluminum CNC oriented.
  • maximum 140k mm/s^2 @ 600mm/s with TMC2209 24V (tested)
  • maximum 160k mm/s^2 @ 600mm/s with TMC5160 55V (tested, nema14 is not as powerful as expected, but way far enough for daily fast printing)
• Z: Voron 2.4 Z architecture (not ready)
  • "belt-driven 4Z lifting the heated bed" seems weird but works fine and can reach 20000mm^2/s @ 60mm/s, so this architecture is keeped in the project.
• No electronics bay.
  • As my testing platform, the electronics changes frequently.
  • I placed some aluminum extrusions at the left and right and bottom to mount PSU and MCU boards and RPIs.
• No full enclosure.

3D Model Link

• https://a360.co/3otfhes
  • This is the online preview for those who do not have fusion360 installed. The f3d file is free to be downloaded.
• https://a360.co/3nV5nW3
  • Latest work.

Misc

• Z system is not ready.
• The whole project is overkilled for daily use, but it is just good enough as my testing platform.
• I am not planning to build a BOM, someone can count bolts and nuts by himself.
• ABS-printed project is deprecated because the CNC version is WAY better.
  • But you will find it's easy to enforce models to be stronger enough, and then print with ABS.