This design is based on the magnetic carriage for Kossel posted on YouMagine by Haydn Huntley at: https://www.youmagine.com/designs/kossel-plus-magnetic-carriage--2modified for mini wheels from openbuilds and10mm ballbearings with m4 threads available from hksupport's ebay store.This design assumes that you are using:2020 V-Slot Aluminum Extrusion: http://openbuildspartstore.com/v-slot-20-x-20mm/  Mini V Wheel Kit: http://openbuildspartstore.com/mini-v-wheel-kit/  and  16-x-10-M4-Threaded-Steel-Ball-Rod-Ends-for-Kossel-3D-Printer-Magnetic-Jointsfrom http://stores.ebay.com/HKSupport?_trksid=p2047675.l2563