It is unfortunate you could not go with the PCB coil method I suggested, it would make for much more secure interconnections (and more consistent coil inductances).

As for the remaining issues, I think that the most significant bug is that the final prints are not accurate, and it pretty much throws anything I would use the printer for out the window.

I'm sure that you guys can find a better calibration method, and as a backer, I hope that you prioritize this as soon as possible.

-UD