Fisher Problem and Fix

The friend's problem with his Fisher printer has probably been fixed. The problem was a snag of the filament when the angle of the Bowden tube was anything other than vertical. The filament enter the heatsink in the hot end through a pneumatic fitting on his printer. neither of mine have that arrangement, so I haven't seen that problem. I made an aluminium tube that helped to hold the Bowden tube vertical, but it didn't quite fix the problem. Some support from the RepRap people and a design for a bracket was sent and printed. This does seem to have fixed the problem, except maybe when the effector is at the top of its travel.

The final arrangement is here:

It's difficult to see how the tube can be anything other than vertical, with all this encouragement...