Better X Carriage for PrintrBot

Hi @all
This is a better X Carriage for the PrintrBot.
I have build one to use it as a little CNC with a Dremel 3000, but the original was to lose.
This new one needs two more linear bearing for more stability.
It works much better without any problems.
Here the link to the Dremel holder for the PrintrBot:
http://www.thingiverse.com/thing:388582