I’ve seen competing (and conflicting) advice from Formlabs in these forums and elsewhere, so I was hoping someone could provide a statement as to whether or not it’s possible to “over cure” parts printed in the standard resins?
Here’s what I’ve read from official Formlabs sources at various times:
- Parts printed in standard resin will not become more brittle over time (as they sit out in the open, exposed to sunlight and other random UV)
- The whitepaper on UV curing from FL seems to indicate that using a cure box with a UV intensity over a specific value will cause the parts to cure less well than parts cured at an “ideal” intensity level
- Parts that are left in a UV cure box for “too long” can become brittle
- Over-curing is better than under-curing, so don’t worry about post-curing parts for extra time
So: do parts printed in standard resin become more brittle if they are over-cured, and if so, is “over curing” in a UV box equivalent to continued exposure to sunlight post-cure, and if so, does that mean parts become increasingly brittle over time?
(Also, out of curiosity, as far as I can tell, while the page here shows a curing temperature of 45 or 60 degrees C as ideal, none of DIY cure boxes linked include any kind of heater. How important is heat to a proper cure?)