Zeepro ZIM bottom extruder V7

___
Update Sept.2015: Printed several spools (kilograms) with this configuration and it works absolutely great - only feeding a new spool can be a bit tricky as already mentioned below
___

Printable without support - I included "printhelpers" for the first layer to stick better on the bed which you have to remove (the magenta surfaces on the CAD screenshot)

You will need at least one M5 pneumatic fitting for each side - if you also want to guide the filament into the extruder block you