- design time earned about $25/hour

- $3666 total revenue

- $3352 in expenses

- ~50 orders fulfilled

- ~3000 hours of logged print time.

This tells the whole story... these numbers are so far off from what they should be that this is not a business, but a charity cosplaying as a business. It's a pity you are going to drop this, I think if you adjust your pricing and become a bit more efficient you can easily make it work. But great you're sharing your numbers, you really just need better customers.

Rules of thumb: 10x on materials, base fee of $3 / hour of print time, $100 / hour design time if < 1000 parts, above that you can start pricing it into the job total.