Yep, I've yet to have a part fail if it's designed anywhere close to robust enough. Even the PETG I use most seems suitable for just about anything that doesn't require exacting rigidity ... like a shifter
.
Proper cross-section, some filets here and there, some webbing and prints can be very strong. Can only imagine how strong Carbon Nylon would be.
Those wingnuts look great. I've been looking into what filaments will stick to what other filaments ... some of them are pretty compatible, not often in a structural sense, but good enough for some applications.
Eventually I'll get some hardened nozzles and try out some carbon or glass filled nylon, or ASA.