Is there an adaptation of the Kossel/Mini Kossel that uses openbuilds 20mm V rail extrusions and delrin wheels rather than 15mm extrusions?
It seems much cheaper than using the hardened steel rails and expensive carriages. I know the legacy kossel was an attempt with bearings right on the extrusion, but that was with metal bearings directly on regular extrusions. The openbuild extrusions and wheels look like they would handle the movement much better. Here’s a link for anyone who doesn’t know what v slot is: http://openbuildspartstore.com/v-slot/
Unfortunately changing my original design from 15x15 to 20x20 mm extrusion is nontrivial because many other sizes need to be adjusted too. But several folks have published pictures or files for their 20x20 mm frame projects in progress, check out the deltabot mailing list on Google Groups.