Experiments with annealing PLA. Not a new subject, but going at this a bit differently. Started on accident - left a print in the trunk of my car, parked in full sun in Summer, in southern California, and - of course - it was after a bit warped.
Baked another of the same print in a 180F (convection) oven, to sad effect. (The orange rocket fighter-like things.)
To go at this more methodically, popped a delicate single/thin walled print into the oven for an hour at 140F. No apparent change. Another hour at 150, no change. Hour at 160 … and visible change (more opaque?), but no obvious change in shape. Hour each at 170, 180, 190, 200, 210, 220, 230, 240, 250, 260F with no apparent change.
At 270F, the first sign of failure - a small shiny spot near the nose, that grew slightly a 280 and 290F.
Starting to look like we can make temperature-resistant more delicate prints. Would want to repeat this exercise, to take less time.
Pictures are most recent, first.