The 3dOne P4 is a 25mm based printer and shared most of its parts with the later P5 model. In fact many of the P5 parts where retro fitted to the P4. The question then is why is it still here. It was built as a dual extrusion printer and therefor has a few differences.
A dual extrusion printer is a pain to get right and you may want to avoid this till your comfortable with your skills.
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