Scalar - Helix Drive system

# Description:
This is an upgrade for the driving system of the Scalar 3D printers( http://www.thingiverse.com/thing:891409 ) heatbed.
It can be installed in parallel of the Dual Drive system upgrade (http://www.thingiverse.com/thing:1766326)
It is using an Helix screw to drive the print platform, and is replacing the

# Special note:
* Support_Colerette_Helicoid.stl: is the flanged nut holder. You need to print it with 100% infill.

# Complementary upgrades:
* Strong jaws System ( http://www.thingiverse.com/thing:1912785 )
* Dual Drive Systems (http://www.thingiverse.com/thing:1766326)

# Upgrade pack available:
The upgrade pack is available on our website:
For Scalar L:
http://3dmodularsystems.com/en/kits-packs/232-helix-drive-system-for-scalar-l-3d-printer-upgrade.html

For Scalar M / XL / XL Premium:
http://3dmodularsystems.com/en/kits-packs/194-helix-drive-system-for-scalar-xlm-3d-printer-upgrade.html

# Updates:
* 2017.02.21 - Fix the nut holder height, it s