Hi, great design! I love the use of the belts in the extrusion channels. I've learned a lot by looking through your github. I'm building an H bot using spectra cord instead of belts and wanted to ask two questions. 1) When you did your research, did you find any significant advantage to the H belt configuration when compared to something like the approach used by CoreXY? 2) On your latest sketchup model, you show three extruders spread across your X axis. Is that just testing ideas or have you come up with something that's going to blow our minds?

Big thanks for posting your work. Much appreciated by the community. Good luck on the next steps, looking forward to seeing the final product.

After a few revision and by using linear bearing pads, it is now moving perfectly in XY ^^ http://youtu.be/fmRBO8UZGwM

does the firmware require any special changes to use h-bot movement?

I do not consider myself stupid but any means.. but i have no clue how 2 motors on belt allows for x to move on its own like is shown in the videos on your flickr stream. Any links or something i could go read to get my head around it.. a quick google search of H bot or H gantry get me no where fast.

Excellent work. I have a long list of customers in the medical and silicon fab industry that are searching for 3D Printers they can operate in clean rooms (Positive pressure). They all worry about exposed belts. While these belts look clean, we all have units with small patches of belt dust at one end or another of the axis's. A unit like this seems to be an excellent way of reducing random particles. Can't wait to see the final unit!

Great work guys now like to see it in working.

Looks great! I like how the belts are hidden in the extrusions. I've been wanting to get away from the moving y-platform, and this looks like a perfect way to do it.