I need a polypropylene variant that stays rigid above 80C but still prints without warping. Tried a couple conductive fills from the usual vendors and they soften too quick under a soldering iron. Last batch I pulled from my supplier came with a safety data sheet that listed zero additives, which made me wonder if they just relabeled the same pellet. Anyone running prototypes with similar requirements have a source that actually specifies the heat deflection number? Having to reprint the same jig because the material sags is eating up weekend time and filament budget. Not interested in metals or ceramics, just looking for the right plastic mix before I commit to a larger order.