Dear Manuel,
This extruder reference from my visit to see the Kamer maker in Amsterdam will be useful in the development of a new extruding tool. We shall focus on getting that 3d Doodler to work but should in parallel begin the design of the larger scope extruder.
It is interesting to notice that as the use PET -G (the Glycol in G helps to achieve viscosity required, otherwise PET is too liquid for FDM) models very flexible units.
MULTI - RESOLUTION 