I've made a V2 of this mod: http://www.thingiverse.com/thing:2060242
Brace yourself......The Cube 3 Firmware has been HACKED!!! :D Some brilliant guys (not me :P) successfully made a Toolbox, to modify the original Firmware, so that it doesn't overwrite the DRM-chip. I was sceptical first but I can confirm that IT WORKS!!! FINALLY the Cube is unchained!!!! :D
Here's the download link with all the instructions you need:
many many thanks to these guys for their efforts!
Additional Material used:
-Festo QSM-3 (3mm to 3mm)
-PTFE OD 3mm/ID 2mm
-PTFE OD 4mm/ID 3mm
-screws M3x16mm (2Pcs)
Aswell you will need:
-M3 thread cutter
The Cube 3 cartridges are well known for beeing unreliable. At least mine tend to break themselve every second time I'm trying to print something. My biggest problem was the tube releasing itself from the little CNC piece mounted to every cartridge. I think the pressure is just to high trough all those sharp angles. So I modified the tubing aswell. Just cut the upper part of the original plastic piece from the extruder needle. Tubes used are 1xID2mm/OD3mm (380mm) and a second tube 4mm ID over the 3mm tube to protect it from folding.
At least one cartridge (I'm using just one and changing the internal filament roll only) works fine now! You can change the filament by disconnecting the tube from the Festo connector, cut the filament flush to the tube, insert the new filament just trough the cogwheel and leave it just before the festo connector begins. Put all together again and make a test-print until the new filament is trough.
Filament Type: PLA
Fill Pattern: cross
Printtime: +/- 45min
How Festo-Connectors work