Time to rebuild my large Kossel

It’s more than a year and a half since I published my large Kossel build blog entry.Since then I have upgraded it many times. Several people have built 3D printers based on this design, and some have asked for a more complete bill of materials. So I decided to create a page on this printer as it is now, including yet more upgrades.

If you’ve built my original 2020 Kossel variant and upgraded it, them you are already using the most advanced 3D printer electronics available – the Duet WiFi. So my focus this time is on upgrading the mechanics, so as to get the best out of the electronics. The new upgrades are:

  • 2017-03-22-20-17-04.jpg2040 extrusion for towers and top horizontals instead of 2020, for increased rigidity
  • Linear rails instead of wheeled carriages, for better alignment
  • Magnetic joints
  • Toothed idler pulleys, to reduce belt vibration
  • PCB effector with built-in lighting and nozzle contact probe, and matching PCB carriage adapters to ensure uniform rod spacing
  • E3D Titan extruder

This is not intended to be a budget printer. If you are in the UK, you can expect the parts to cost about £700 including VAT.

I considered moving the tower motors and electronics to the top, so that the electronics are more accessible instead of being under the bed, and better separated from the mains wiring. However, if the Robotdigg metal corners are used then the base would be only 40mm high, which is not enough to accommodate the power supply and the mains inlet components. One possible way round this would be to bolt three 2060 horizontal extrusions to the corners even though they are intended for 2040, and to mill an opening in one of the 2060 extrusions to accommodate the mains inlet components.

You can find the full instructions and the link to the parts list here.

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