Quote Originally Posted by RobH2 View Post
Yes, I did create a chamber and used a heated bed but I must still be getting a draft. I did read about using PVA glue on the glass so I tried that. It worked like a champ, only one problem, as the part dried, it cracked the expensive borosilicate glass.
Whoa :O

I've never printed things that large from Nylon, but I used to un-tension ABS parts mid-print. I used a hairdryer to rapidly raise the temperature of the whole model and chamber, to make it approach the lower glass transition temperature of nylon (did it by the thumb), then let it cool in normal ambient temperature of the print chamber. This may help.