In a recent post @markal, from S. Africa, only got 25.4mm OD tube, and the plastic is in ‘suffering’.
1 - After the XY axes are built
2 - With these tools http://www.thingiverse.com/thing:1563870
3 - I guess if is possible to heat specific bolts with a soldering iron, in order relieve the stress from the bearing/plastic/tube?
Is a risky operation
My build is totally in ABS (a challenge to print), and all OK for now with XY. Steppers wired in series and can go up to full 2A: Higher torque until 10-15 rps and then looses to parallel, but that means speeds in excess of 380 mm/s with a 16T pulley!
Bye and thanks the community for making it real!