I have shot hundreds and hundreds of worms and grubs through SLA printed molds. SLA doesn't use infill or supports, and wont crack like typical ABS material FDM prints. I typically don't see cracks above 25% infill on FDM either.
Here is some info on the resin for others out there.
https://support.formlabs.com/hc/en-us/articles/115000015670-Using-Tough-Resin
Sure it has a 30th of the modulus of aluminum - but if you are hand injecting I cant see building enough pressure to matter.