The plastic(HDPE, PP, ? forget) fuel tank in My '87 Dak is the only thing that hasn't deteriorated yet here in the salt belt. Castable plastics usually top out@280°F, and structural items like intakes, splash-shields are usually fiber reinforced. I looked at printers, but large enough ones were a bit much, & initial research on the materials for a finish product wasn't thorough. Interested in the promise of these tho'.
