Almost by accident, I ordered a spool of POM (aka Delrin/Acetal). It is a plastic with awesome mechanical properties. There is an article on HAD about it, published recently.
Judging from what I've read on the internet, as 3d-printing material, POM seems to be prone to extreme warping, and extreme problems with first layer adhesion. Perfect candidate for testing my method!
I'm a little bit worried of using it, because if overheated, it is known to release formaldehyde, which is quite seriously toxic.