PTFE X-axis carriage, on aluminium profile, Mmax,Prusa upgrade

I consider it as working. I am using an "open" carriage from ABS to hold the extruder and PLA/PTFE profile mount underneath. Maybe a full PLA carriage may work, if not relaxed from hotend's heat.

I changed the Y-axis also, but i have to experiment more in order to have the same results i saw with the X axis.

This is the carriage for aluminium profile x axis, using this http://www.thingiverse.com/thing:171294 for the ptfe rail and simonious idler+motor holder. At Simonius profile ( htt