After the success of my first printable extruder design (the Printruder, see http://www.thingiverse.com/thing:958 ), I wondered, if there would be an even simpler and better design for a Printruder.

This is what I came up with.

Please note, that there are two flavors of the main part ("Motor Block"):

• Motorblock_v7_TimerBeltPulley.stl
  This design is for use with the standard timer belt pulley, which comes with the MakerBot Extruder MK3/MK4.
• Motorblock_v7_WormGearPulley.stl
  This design is for use with a 10mm worm-gear style pulley

You only need one of both. Be sure to print the correct one!

The PCB holder parts are optional.

There's a post on my blog on this with more detailed information and step-by-step build instructions:
http://pleasantsoftware.com/developer/3d/2010/03/08/printruder-ii/

In order to mount the Printruder II in a MakerBot, you might want to print also a pair of Printable Extruder Holders: http://www.thingiverse.com/thing:1912

• print one of the both Motor Block parts
• print the Idler Block part
• (Optional) Print the PCB holder parts
• Follow the step-by-step instructions at http://pleasantsoftware.com/developer/3d/2010/03/08/printruder-ii/ to assemble the whole thing.