kossel carrier with 6 Bearing V3

A kossel carrier design. With this one, bearings won't bear axial force and only bear Radial force. So kossel will run at long time without loses of precision. Work with European Aluminum profile.

Screw is 5mm，15mm or no longer than 20mm. Nut is useless. The diameter of the bearing is 16mm. The diameter of the bearing hole is 5mm. The width of the bearing is 5mm.