About this 3D model

I had some problems with the original MK5. My hot end was moving during filament retraction. I made a new locking system using two M3x10 bolts. I also had to modify the body. If you have problems during slicing, try with the latest version of Slic3r (1.0.0.2 RC2). I will add two holes to maintain accessories in the next version. Apologies for the english translation, I'm french...