Bulldog clamps, they're household spring loaded clamps used to hold mops & brooms up off the floor.
All parts are hardware store items, minus the heating element.
Some MDF, Pegboard, aluminum angle, metal conduit, etc;
A correction, I posted PETG, I think its PET.
Good question, I don't know the mil, but I'll throw a caliper on it for you, gimme a sec.
I've formed polystyrene up to .060 and 3/32. It should do 1/8 inch too (I know, your lovin the imperial measurements)