Ultimaker Syringe Extrusion System (quickmountable)

Features:
* It can be mounted & removed within seconds facilitating the:
Ultimaker Generic HeadMount
http://www.thingiverse.com/thing:20775
* No z buildspace is lost. If you crash the syringe into the build platform it will just slide upward until the z endstop is reached - no damage.

Restrictions:
* springiness of the dyneema thread (preextrusion needed)
* If you have a custom extruder you might be required to redesign the winder coupling part.
* The current design uses
"Ultimaker BowdenFeeder Repair Kit"
http://www.thingiverse.com/thing:10799
* The current design only works with the old style hobbed bolt which has a hexagonal head

Credits:
* This design was heavily inspired but not directly derived from
http://www.thingiverse.com/thing:14421
"ultimaker syringe extruder II" by joris
It was redesigned from scratch to gain more parameterisability
and instead of the plastic filament it uses a dyneema thread to pull the piston in.

Notes:
* A re