Nylon With ASA Support
I’ve been helping my friend Damen 3D print parts he’s designed for his monstrous C2 Corvette track car build. One part he needed printed was a fuel filler neck to connect the car’s original fuel filler opening with the top port on his new race-spec fuel cell.
We couldn’t use ASA (my high-temp material of choice so far) since the part would be in direct contact with gasoline, and gasoline dissolves ASA. I had just gotten my Bambu Lab H2D, so this was a perfect chance to have my first try printing nylon, we chose PA12-CF.
We ran a few prints in PLA to dial in the shape/alignment in the car. This also gave me a chance to think through print orientation and support. The final design ended up having internal threads, large flat flares on the ends, and a long wandering path that maked bed adhesion and support critical.
I used the H2D’s second nozzle to print support in ASA. Since it can’t chemically bond to nylon, it let me set a 0-distance gap between the support and the part. Blue painter’s tape gave plenty of bed adhesion, but I added a support column in CAD that gave some extra insurance that the part wouldn’t try to tip over.
The first print came out flawless. When I pulled the part up off the bed the ASA support stayed behind. Even the top overhang features printed beautifully with no support.
Damen installed the part in the car and hasn’t reported any issues so far.
