work in progress: rails with 624vv + square profile 10x10mm.
Very cool idea. The square tubing is easily available and cheap, how about the bearings?
EDIT: Nevermind. Bearings are about $0.50/ea on ebay. Nice!
wow … link?
I buy 20 for 13$ …i no publish STL because need other test now have to much resistance and no know real precision. But i want create something modular with openscand(insert only profile size)
Humm will be interesting to see how long those hardened steel bearings last on soft aluminum.
Yep good question…but exist iron profile too 
That is true.
A good source for cheap delrin v-wheels would be nice.
That would also work well
ok i publish test 2 (only for testing)