Might have done it finally.
Heating the inside of the pipe with air, sheet with propane.
Not perfect but good enough I hope. Will know when it cools down.
Can I just ask you, what are you bending these for?
Hopefully I am going to source a piece big and heavy enough that I can just make a cover door for the CNC Lathe and bend it and it be totally self supporting without a steel frame. That's the plan anyway. What material is it exactly you are using? Polycarbonate?
There are many reasons to have a printer in an enclosure. Sound, equalized temperature, cooling rate. Not necessary nor wanted for all occasions though. One reason for me is to be able to run it overnight without risc of the cats getting to it :) Been fabricating parts a while, printing...