Kossel

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Revision as of 15:22, 22 June 2013 by Johann (talk | contribs) (Bill of Materials)
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Kossel

Release status: experimental

Kossel.jpg
Description
Delta robot 3D printer with extrusion frame.
License
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CAD Models
External Link


Kossel is a parametric delta robot 3D printer, built in 2012 by Johann in Seattle, USA, based on his Rostock prototype.

It is named after Albrecht Kossel, German biochemist and pioneer in the study of genetics. He was awarded the Nobel Prize for Physiology or Medicine in 1910 for his work in determining the chemical composition of nucleic acids, the genetic substance of biological cells.

Design Goals

  • Zero backlash.
  • Speed: 320 mm/s in all 3 directions.
  • Resolution: 100 steps/mm in all 3 directions.
  • Repeatability: better than 0.03 mm (30 micron)
  • Build volume: cylindrical, 170mm diameter, 240mm height.
  • Footprint: triangle, 300 mm width (240mm OpenBeam + printed corners).
  • Frame height: 600 mm.
  • Print surface: round glass, doesn't move.
  • Mass of end effector with hotend: less than 50 grams.
  • Simplicity: fewer than 200 parts.
  • Hardware cost: less than $600 USD.
  • Fully automatic print surface level calibration (autolevel).

Optionally scale down to fit within IATA hand luggage size limit:

  • Frame height: 550 mm.
  • Footprint: triangle, 270 mm width, 250 mm across (210mm OpenBeam + printed corners).

Bill of Materials

Printed parts

Frame

Fasteners

  • 100x M3x8mm stainless steel screws (frame and most connections)
  • 100x M3 stainless steel nuts
  • 100x M3 nyloc nuts
  • 12x M3x25mm stainless steel screws (belt idlers and effector-rod attachments)
  • 6x M3x35mm stainless steel screws (tensioners)
  • 12x M3x16mm stainless steel screws (push rod attachment)
  • 6x M2.5x12mm screws (micro switches)
  • 3x M2.5x16mm (automatic bed leveling probe)

Linear motion

  • 3x 400mm hardened steel rail and carriages HIWIN MGN-12H
  • 3x 1164mm GT2 belt closed loop with 2mm pitch and 6mm width
  • 6x F623ZZ flanged bearings 3x10x4mm (or F684ZZ 4x9x4mm for printed parts before June 21st)
  • 3x GT2 pulley with 16 teeth and 2mm pitch
  • 3x Kysan NEMA17 stepper motor

Diagonal push rods

Bowden

Endstops

Automatic bed leveling probe

  • 1x Micro switch (same as for endstops above)
  • 1x Bondhus 1.5mm allen wrench
  • 1x Safety pin with 2.5mm loop
  • 2x Ball point pen spring
  • 1x Euro-style terminal block connector
  • 1x Heat shrink tubing ID=2mm

Electronics

Links