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Kossel Kumu-3D Printer
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.github Create FUNDING.yml May 24, 2019
images With flying extruder. Nov 23, 2017
LICENSE.txt Create LICENSE.txt Feb 27, 2017
Makefile Updated the Makefile. Sep 23, 2019
Orbitron_Medium.scad Initially committed the first parts. Mar 25, 2017
README.md Update README.md Nov 28, 2018
aBracingPost.scad Modified the M3 hole to make it larger. Aug 11, 2017
aBracingPost.stl
azsmzPlate.scad Modified AZSMZ holder to accommodate capacitor. Apr 23, 2017
azsmzPlate.stl Modified AZSMZ holder to accommodate capacitor. Apr 23, 2017
carriage.scad Add files via upload Mar 10, 2018
carriage.stl Uploaded the latest versions. Sep 23, 2019
carriage4.scad The better, more stable 4-wheeled carriage parts. Sep 14, 2019
carriage4.stl Uploaded the latest versions. Sep 23, 2019
carriage4Outside.scad The better, more stable 4-wheeled carriage parts. Sep 14, 2019
carriage4Outside.stl
carriageOutside.scad Add files via upload Mar 10, 2018
carriageOutside.stl Uploaded the latest versions. Sep 23, 2019
configuration.scad Removed some unused definitions, and added m5NutHeight. Sep 14, 2019
copperPipeBearingHolder.scad Now uses slightly smaller, tapered M3 holes. Jan 6, 2018
copperPipeBearingHolder.stl
copperPipeSpoolHolder.scad Made them taller, to avoid bumping into flying extruder. Sep 14, 2019
copperPipeSpoolHolder.stl Made them taller, to avoid bumping into flying extruder. Sep 14, 2019
e3dWedge.scad Added my locking E3D wedge. Mar 26, 2017
e3dWedge.stl Added the STL version of my E3D locking wedge. Mar 26, 2017
effector.scad Removed some unnecessary holes. Sep 23, 2019
effector.stl Removed some unnecessary holes. Sep 23, 2019
flyingExtruderSuspender.scad Strengthened it a bit. Sep 14, 2019
flyingExtruderSuspender.stl Strengthened it a bit. Sep 14, 2019
fusePlugHolder.scad
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
keyBakLifter.scad Added Key-Bak lifter to help support flying extruder. Sep 14, 2019
keyBakLifter.stl Added Key-Bak lifter to help support flying extruder. Sep 14, 2019
lowerFrame.scad
lowerFrame.stl
mksSbasePlate.scad Fixed a typo in a comment. Apr 2, 2017
mksSbasePlate.stl Minor changes. Sep 14, 2019
motor.scad Renamed constants. Sep 14, 2019
powerSupplyHolders.scad Added power supply holders. Apr 15, 2017
powerSupplyHolders.stl Added power supply holders. Apr 15, 2017
roundedBox.scad
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 Made the horizontal M3 hole slightly more tapered to grip better. Sep 14, 2019
upperFrame.stl Made the horizontal M3 hole slightly more tapered to grip better. Sep 14, 2019
upperFrame9mm.scad
upperFrame9mm.stl Added versions for 9mm belts. Aug 10, 2017
vertex.scad Modified the vertex. Aug 10, 2017
zProbe.scad
zProbe.stl Corrected the rights message. Sep 23, 2019
zProbeVolcano.scad
zProbeVolcano.stl z-probe for a Volcano hotend. Sep 23, 2019

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.
  • flying extruder for better retraction performance.
  • optional 9mm GT2 belts for increased precision.
  • 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 -- nine Kumu-3D's have been built and are printing, and two more are on the way! I'm in the process of writing up how to build them, which is at: Assembly Instructions

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           Kumu-3D Top (no spool)

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. (These were printed before switching to using the flying extruder.) Note how nicely it handled the overhangs.

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