Kossel Kumu-3D Printer
OpenSCAD Makefile
Switch branches/tags
Nothing to show
Latest commit 82744f3 Aug 11, 2017 @haydnhuntley haydnhuntley Modified the M3 hole to make it larger.
It was too small.
Permalink
Failed to load latest commit information.
images Corrected rotation a second time. May 26, 2017
LICENSE.txt Create LICENSE.txt Feb 27, 2017
Makefile Added versions for 9mm belts. Aug 10, 2017
Orbitron_Medium.scad Initially committed the first parts. Mar 25, 2017
README.md Added to 3DBenchy descriptions. May 26, 2017
aBracingPost.scad Modified the M3 hole to make it larger. Aug 11, 2017
aBracingPost.stl Modified the M3 hole to make it larger. Aug 11, 2017
azsmzPlate.scad Modified AZSMZ holder to accommodate capacitor. Apr 23, 2017
azsmzPlate.stl Modified AZSMZ holder to accommodate capacitor. Apr 23, 2017
beltLocks9mm.scad Added versions for 9mm belts. Aug 10, 2017
beltLocks9mm.stl Added versions for 9mm belts. Aug 10, 2017
carriage.scad Shortened spacers. Apr 14, 2017
carriage.stl Shortened spacers. Apr 14, 2017
carriageOutside.scad Added outside carriage pieces. Aug 10, 2017
carriageOutside.stl Added outside carriage pieces. Aug 10, 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 Added 5mm more room for silicone bed heater. May 14, 2017
glassHolder.stl Added 5mm more room for silicone bed heater. May 14, 2017
lowerFrame.scad Corrected printed weight. Apr 15, 2017
lowerFrame.stl Modified the vertex. Aug 10, 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 Modified the vertex. Aug 10, 2017
upperFrame.stl Modified the vertex. Aug 10, 2017
upperFrame9mm.scad Added versions for 9mm belts. Aug 10, 2017
upperFrame9mm.stl Added versions for 9mm belts. Aug 10, 2017
vertex.scad Modified the vertex. Aug 10, 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, magnetic, zero-backlash 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 yields a maximum Z of 290mm and maximum diameter of 260mm. 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 no longer a Work-in-Progress -- the first Kumu-3D has been built and is printing, and three more are on the way! Now I can begin documenting the build process while building my second one.

This isn't an average printer, it 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

Here are some photos of Kumu-3D#1: Kumu-3D Front Kumu-3D Corner Kumu-3D Top

Here are some photos of a 3DBenchy torture test printed in PLA at 60mm/sec: 3DBenchy Left 3DBenchy Right 3DBenchy Angle There is a little bit of very fine stringing, so I'll need to increase the retraction or lower the temperature. Note how nicely it handled the overhangs.