I like the idea of this but you need to recognize that if people put in money for this they are part owner of the mold until they are at least reimbursed.
Secondly I think you will have more success if you give those who are contributing to the purchase a better deal than just returning their money when they get a splitter. For example, if I gave you $50 to buy the mold, I would expect more than a $50 discount for putting my money at risk.
Good luck, looking forward to seeing what happens here.
Agreed.