SLA vs FDM 3D Printed Rocket Igniter - Prototyping at High Temperatures With Clear Resin
See why @SamRogers chose SLA 3D printing over FDM or metal 3D printing to prototype a vortex-cooled rocket engine igniter.
This is an experiment testing a vortex cooled rocket engine. The chamber is very small and designed as a torch igniter for a larger rocket engine.
If we were to 3D print this on a normal FDM printer in thermoplastic, the parts would melt and become unusable as soon as they became warm or hot.
Under a blow torch, the resin part ablates, which means it burns away a surface layer but remains mostly intact. The printed thermoplastic part melts, losing its form.
Printing this small combustion chamber in resin allows for short test firings while avoiding the very high cost of metal 3d printed parts.
As you test for longer, the nozzle throat slowly erodes, but you get a good few seconds of testing before it does.
The transparency of these parts is what makes it a brilliant demonstrator, because you can see the combustion taking place inside the chamber.
A new nozzle later, and we got the best firing yet: a clear supersonic mach diamond pattern is present in the exhaust.
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