A Delrin tutorial for those that haven't played with it yet.

[Mark Ross]

hackadaydotcom/2015/09/22/drawbacks-of-lased-delrin-and-how-to-slip-around-them/#more-167424

[Steve Clarkson]

And don't forget that the off gas of delrin is formaldehyde.

[Julian Ashcroft]

On the same site there's an interesting article about marking stainless steel with a laser after coating the steel with a mixture of plaster and isopropyl.