Prusa i3 Z carriage for M8 lead screw

Didnt like the idea of regular threaded rod and didnt like the way the nut was retained. So I changed the end carriages to use an M8 acme leadscrew and brass nut thats readily available on Ebay from multiple sellers.

Also includes a modified tensioner bracket. works with a 1/4-20 square head bolt. bolt is inserted from the inside and a hex nut or threaded thumb wheel is added on the outside for tension adjustment.

*EDIT* 9-6-15

I had to remove the idler bracket. the bore for the l