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Why not just mount the Titan with a pancake stepper (like the ones used here: http://forum.seemecnc.com/viewtopic.php?f=35&t=10225) directly to the extruder? with no bowden tube, like any cartesian direct feed. If it's too much weight, then add a counterweight pulley system. Or it's still a lot of ...

Jassper wrote:Why not pull the extruder out of a 3Doodler?
I have often thought about it but have not tried it. .... yet.

Because you'll be spending at least $50 for one and you still don't have the encoder there. The parts discussed in the reprap forum are less than $10.

Just some heads-up on recent work using DC motors posted on reprap forums. http://forums.reprap.org/read.php?1,661444 Best design so far is 15g with 2kg force. Should be easy to adapt to any Delta. [img]http://forums.reprap.org/addon.php?1,module=embed_images,url=http%3A%2F%2Fforums.reprap.org ...