K8200 / 3Drag dual Z-Axis

Some other dual z-axis for Velemann K8200 / 3Drag
No space loss for Z movement.

Parts:
belt: Neopren 506-XL-037 (other langs with the different spanner possible)
bearing: 626-2Z
8mm spring needed for Dual Z Arm
Endsupport from there:
http://www.thingiverse.com/thing:175137

Arm with backlash eliminator inspired from:
http://www.thingiverse.com/thing:235494

Sliced with Cura, inner diameter shuld be sliced right with Slic3r to.
Optimized for innerdiameter bu