I wanted to build one because I found this 3 in 1 out mixing extruder on ebay and thought it would be awesome to have. But as the project progressed I didn't find too many other models of a 3 filament printer to go off of or at least loosely base my plans off of. So everything you see is what my mind could come up with. I mounted the 3 spools 45 degrees from each other and did the same with the wade extruders and then tilted each one back 45 degrees and ran the filament the specific way I did so its path would keep an arc that is compatible to the natural bend in the filament from being wrapped around the spool. Maybe I over thought that. This is only my hobby. I am used to building on a larger scale:
http://www.digitalcorvettes.com/foru...d.php?t=271354
http://www.digitalcorvettes.com/foru...d.php?t=242081
http://www.digitalcorvettes.com/foru...d.php?t=241858
http://www.mp3car.com/forum/general/...al-time-tuning
http://www.mp3car.com/forum/mp3car-t...controller-bcm

I could post a bunch more links. I have a lot of build threads. I love to build. I will continue to revise this printer again and again first to make it function well, And then to make it take up less real estate, and finally I will try to make it easy on the old eyes.