G-slot carriage for delta printer

Steel balls are glued with epoxy to the part holes. Belts are fixed by placing a loop inside the slot and later inserting a piece of filament inside the belt in the loop to keep it from sliding out.

Bill of materials

Two 10mm steel balls.
Four 15mm M3 bolts
Four v-shaped bearings.
Epoxy

I got the extrusions from here: http://www.makergal.es/#!g-slot/c1ktz