Unwired Mini Kossel

Sturdy and simplistic Mini Kossel variant with 2020 extrusions. I wanted a "travel" delta, one that I could easily grab and bring with me anywhere. It had to look nice, and wow people. This is the result.

3D printer parts and enhancements

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Hidden wiring. All wires run inside extrusions and top/base corner parts.

Very rigid. Base corner part is 60mm high, and 2020 extrusions ensure no wobliness.

285mm build height, due to raised hotend. Only the hot part is under the effector, giving almost 40mm extra build height. Also the bed is lovered into the frame, giving 10mm more.

Fold up universal spool holder on the back.

Easy load extruder on the back tower. Filament is routed via a guide, to prevent kinks.

All parts are my own design, but with heavy inspiration from all the other delta style printers on the internet.

Please note, that some parts are drilled with 2.5mm drill bit, and then tapped for M3 threads. I have only used M3 nuts when I felt it was necessary.

CHANGES 2015-05-19
Tower Plate V2 fixed.stl - it was missing a hole. Lots of downloads, and *no comments* about this. Amazing.
Spring extruder plate 2020 tight.stl - the extruder for NEMA17 and MK8 gear. I updated it with tighter tolerances, as I found the arm a bit flappy.

CHANGES 2015-04-26
Arduino Holder.stl - reinforced mounts for 40mm fans
Lower Corner.stl - bigger hole for internal wiring, added logo
Upper Corner.stl - slightly bigger hole for internal wiring
ADDED Tower plate V2.stl - this version does not need to be tapped for M3. Just use nuts instead. You need a 16mm bolt for the left side and a 20mm for the right side.
ADDED Effector with fan cooling.stl - experimental design with two fans. Both fans blow air into the effector. When the printer is powered up, one fan is constantly running to cool the hotend. Most air escapes through the other fan (which is turned off). To cool your print, the second fan is turned on, forcing air out through the 20 small air-channels in the bottom. Try it!
ADDED Fold Down Spool Holder Parking Clamp.stl - haven't had time to test it yet.

Materials and methods


  • ~25 x 6mm M3 hex cap screws

  • ~100 x 10mm M3 hex cap screws

  • ~50 x 20mm M3 hex cap screws

  • ~6 x 35mm M3 hex cap screws

  • ~10 x M3 nuts

(I'd recommend just getting 100 of each, I've probably used more)


  • 9 x 240MM 2020 extrusions

  • 3 x 620MM 2020 extrusions

  • 100 x T-slot 3mm inserts (it's going to be a b*tch to assemble with M3 nuts)

  • 45 x 10mm M3 hex cap screws


  • 6 x F623ZZ flange bearings (3x10x4mm)

  • 3 x 20mm M3 hex cap screws

  • 3 x M3 nuts

  • 3 x NEMA17 stepper motors

  • 3 x MGN12 12mm miniature linear rail slide 400mm rail

  • 3 x MGN12H carriage

  • 24 x 6mm M3 hex cap screws

  • 5m GT2 belt

  • 3 x 16 teeth GT2 pulley for NEMA17 steppers

  • 3 x micro switches 20x10x4mm (epoxy glued on)


  • 1 x E3D hot end V5 or V6 for 1.75mm bowden extrusion

  • 12 x 20mm M3 screws

  • 6 x M3 nuts

  • 1 x 240mm Mini Kossel carbon fibre Traxxas arms kit (3 arms, 12 Traxxas rod ends, 12

  • 4mm screws, glue etc).

  • 3 x rubber bands for stiffening up the Traxxas rod ends

  • 1 x 30mm fan 12V (10mm thickness, for cooling hot end)


  • 1 x NEMA17 stepper motors

  • 1 x 600mm 4OD 2ID PFTE tubing (bowden tube)

  • 1 x pneumatic push connector 4mm to M5 (for extruder)

  • 5 x 16mm M3 hex cap screws

  • 1 x 12mm M3 hex cap screws


  • 3 x 15-20mm stiff spring

  • 1 x 180mm borosilicate glass plate

  • 1 x 180mm silicone heater pad

  • 1 x 180mm foam pad (ca. 8 mm thickness)

  • 1 x 180mm stiff heat resistant material

  • 1-2 x rubber bands

  • 3 x 6mm M3 hex cap screws

  • 3 x 35mm M3 hex cap screws


  • 2 x 608ZZ bearings

  • 1 x 15-20cm M6 threaded rod


  • Arduino Mega 2560

  • Ramps 1.4 board

  • 4 x stepper drivers


I used an Xbox 360 PSU I had, it's 175W and can do stand-by via PS_ON connector


  • Soldering iron / multimeter

  • Unbraco set with rounded heads (otherwise some parts are impossible to assemble)

  • 3D printer for parts you see here

  • Dupont connectors and crimping tools for reliable connections

  • Patience / lots of spare time



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