Filament extruder puller

This winder is a remake of the Lyman extruder filament puller (see
http://www.thingiverse.com/thing:380987 ) .

The original design is using a stepper motor, and this design a geared DC motor.
This design is more compact, with the motor on the back.

I have used this motor to extrude lots of filament, and it really helps to keep the extruded filament nicely constant in diameter. It does not damage the filament in any way. It keeps it smooth surface and round shape.

The pressure on the filament is made with 2 springs, and the pressure can be adjusted with the screws.
It holds the filament very good, and need quite a couple of kg pull force before it starts slipping.
In order to get the filament out, you need to lift the top parts. Getting it is in easy: just push it against the running rolls, and it is pulled in.

The design uses a 60rpm motor. This gives a good adjustment range for both 3mm and 1.75mm filament extrude speeds. If the speed range is not matc