Carriage for Kossel Mini (replaces ball rails)

Building a Kossel Mini? If you can't find those ball rails spec'ed for it, don't want to wait until the Kossel Pro kickstarter ends, and want to save over $50, this part gives you another option.

This is a Cerberus Pup-style carriage for Kossel Mini. It provides smooth motion with low cost (~$70 for 3) on OpenBeam, using Graber Dual 623 V rollers. It supports an unmodified Kossel ball joint adapter (ball joint adapter) since the 20x20 m3 grid matches the spacing on the ball rails specified for the Kossel Mini. Just drop it in, and besides this part, nothing needs to change on your Kossel Mini build.

If the ball rails sold by OpenBeamUSA are:

• not in stock,
• too expensive ($150), or
• not long enough (only 400mm limits Kossel size to slightly over 600mm)
  ... then this part may be for you.

Requires 3x Graber Dual 623 V rollers per carriage, which are $7.45 apiece.

Note the non-commercial CC license - a requirement, since this part derives from Chillance's original integrated version.