- calculate the costs of each part adding supplies (PLA, tape, cutter blades, sanding paper, etc)
- Add labor (my time spent designing, setting up the machine, and maybe toolpath calculation) + hardware amortization (machine cost + parts shipping + extra tools I bought).
- Then multiply by some safety factor to account for failed attempts.

I will start with a hardware amortization cost of 2 euros per hour and a safety factor of 1.5, but the latter will surely change with time and experience.