This seems like something that should have been asked already, but a search turned up nothing. Can I over cure a part? Is there a point where the resin is fully cured and more UV just doesn’t do anything? Lets say I left some parts in my UV chamber for a week, could that cause deformation? The rea…

I use a UV nail curing box, and when leaving parts in for several hours, I have seen several effects: Warping can occur if the part is very thin and doesn’t have support. I have left the support structure attached to the part while to cures to prevent warping, but this makes removing the support s…

Charles had a great summary of the effects. I can give a bit more detail on the material property changes that will happen. Post curing continues polymerization process that happens in the machine. Increased polymerization will generally lead to: A bit more shrinkage. This can lead to warping,…

Is there a good way to know when is enough?

In my experience i never post cure sla parts longer than 15mins. I would just carefully syringe IPA through the part using your drain holes until all resin is out then blow compressed air in hole at a low psi to dry. If you look at my post yesterday of the small radio i built,it was hollow with 2m…

I usually cure it until the surface is no longer tacky to the touch. This also means that if I place two printed parts in contact, they won’t glue themselves together because the outside has been fully cured.

In the reverse of that, is it possible to use resin to “glue” parts together when they are still tacky, and bond them together by post-curing? I’ve noticed that our parts in clear resin get a yellow tinge to them, regardless of whether or not they have additional curing. Is there any way to prevent…

Certainly! I have used a little extra resin and a laser pointer to spot glue parts together. I have not had clear parts yellow unless I over cured them. Even when they did yellow, I could often lightly sand off this outer yellowed layer.

And repair. I sometimes break off either small features, or chunks (chunks come off with the support removal). The fix is to dob on small drops of resin and then use the finger nail blue box to cure. Sand down to the original shape and you’re back in business without a total re-print. If you don…

Over curing a part

Support & Troubleshooting

Greg_Bethel April 3, 2015, 5:21pm 10

You can use a UV-resistant clearcoat on the parts - see this post.

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Over curing a part

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