Kossel Kumu-3D Printer
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Latest commit c67bc1e Apr 23, 2017 @haydnhuntley committed on GitHub Finished testing the printed parts.
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Makefile Added power supply holders. Apr 15, 2017
Orbitron_Medium.scad Initially committed the first parts. Mar 25, 2017
README.md Finished testing the printed parts. Apr 23, 2017
aBracingPost.scad Added the pieces for implementing A-bracing. Mar 30, 2017
aBracingPost.stl Added the pieces for implementing A-bracing. Mar 30, 2017
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azsmzPlate.stl Modified AZSMZ holder to accommodate capacitor. Apr 23, 2017
carriage.scad Shortened spacers. Apr 14, 2017
carriage.stl Shortened spacers. Apr 14, 2017
configuration.scad Upper/lower frame modifications. Apr 1, 2017
copperPipeBearingHolder.scad Updated a comment. Apr 15, 2017
copperPipeBearingHolder.stl Add files via upload Mar 25, 2017
copperPipeSpoolHolder.scad Made keyway thinner for RobotDigg extrusions. Apr 15, 2017
copperPipeSpoolHolder.stl Made keyway thinner for RobotDigg extrusions. Apr 15, 2017
e3dWedge.scad Added my locking E3D wedge. Mar 26, 2017
e3dWedge.stl Added the STL version of my E3D locking wedge. Mar 26, 2017
fusePlugHolder.scad Added the fuse/plug/switch holder. Apr 1, 2017
fusePlugHolder.stl Added the fuse/plug/switch holder. Apr 1, 2017
glassHolder.scad Modified it for M5x12 -> M5x15 Apr 15, 2017
glassHolder.stl Modified it for M5x12 -> M5x15 Apr 15, 2017
lowerFrame.scad Corrected printed weight. Apr 15, 2017
lowerFrame.stl Upper/lower frame modifications. Apr 1, 2017
mksSbasePlate.scad Fixed a typo in a comment. Apr 2, 2017
mksSbasePlate.stl Made some of the M3 holes a little tighter. Apr 1, 2017
motor.scad Upper/lower frame modifications. Apr 1, 2017
powerSupplyHolders.scad Added power supply holders. Apr 15, 2017
powerSupplyHolders.stl Added power supply holders. Apr 15, 2017
roundedBox.scad Upper/lower frame modifications. Apr 1, 2017
smoothieboardPlate.scad Made some of the M3 holes a little tighter. Apr 1, 2017
smoothieboardPlate.stl Made some of the M3 holes a little tighter. Apr 1, 2017
upperFrame.scad Fixed a bug in the upperFrame. Apr 2, 2017
upperFrame.stl Fixed a bug in the upperFrame. Apr 2, 2017
vertex.scad Upper/lower frame modifications. Apr 1, 2017

README.md

kumu-3d

The Kumu-3D Printer

Kumu means teacher in the Hawaiian language.

I wish to thank Johann C. Rocholl for his groundbreaking work on the Rostock and Kossel 3D Printers. This design was derived from his work and that of many other innovators.

The Kumu-3D is a Delta printer improving on the Kossel Plus, which I designed to extend and improve on Johann's original Kossel.

The Kumu-3D's features are:

  • 300mm diameter borosilicate build plate, yielding a build area over 250mm in diameter.
  • 250mm diameter 24V 250W silicone heater.
  • 24v power supply, to give the motors twice as much power for faster acceleration and more precise positioning.
  • E3D hotend.
  • 32-bit Smoothieware controller from AZSMZ, with LCD display.
  • Carbon fiber, zero-backlash magnetically jointed arms.
  • 0.9° motors, 1/32 stepping, 16-tooth pulleys yield 400 steps/mm with a worst case real world resolution of 20µm and an average resolution of about one-third of that.
  • Dampers for near silent operation.
  • 2020 extrusions with diagonal bracing for increased stiffness.
  • Integrated spool holder with bearings on top.
  • Build cost around $600 in quantity one, including US shipping.
  • With the standard 750mm vertical extrusions and 304mm arms, it should yield a maximum Z over 250mm and diameter slightly over 250mm. With 1000mm vertical extrusions and 360mm arms, it should yield a build height of over 500mm and diameter up to 300mm.

Here is the GoogleDocs spreadsheet containing the Bill of Materials. Here is a list of the fasteners required and where they are used: Fasteners

Note: this is a Work-in-Progress, but I plan to have the prototype finalized by the end of April 2017, so it is ready for the start of the summer class in June 2017. So far the parts have arrived and I've assembled the frame. At this point it is safe to print all of the parts which have been published, because I've tested them. Next I'll wire up the electronics and install the bed and hotend.

This isn't an average printer, this is an extraordinary one.

I am creating this project for students at Maui College and hope it is useful to enthusiasts everywhere! :-)

Here is a link to the extruder (designed by Shane Beeder): ArmDrive Bowden Extruder
I use the version for the Mk8 drive gear and the alternative arm which uses a 4mm nut to secure the PTFE tubing. Note: print the two arm parts in ABS.

Here is a link to the AZSMZ's LCD display holder (designed by Rick Yang): LCD mount for AZSMZ 12864 with TF slot