BBMBBF had a good write up on what it took for the commission of creating a 3d figure, printing it out and the post processing to make it look good. It's mostly in response to questions some have of why his price is what it is, though I don't think the actual price was actually mentioned. Unfortunately (depending on your pov) I only saw it on his inkbunny account.

As I do more with my 3d printer, more being something other than printing a self-upgrade part, I've wondered too what I should charge if I were to do prints for others. From what I've read so far it seems to be standard practice to have some set base fee and then add a $x per hour charge that's set at a point that covers the cost of the filament, electricity used, wear and tear on the machine, and of course profit. If you're making the 3d model file, that should be included as well, though up to you if it's by the hour or at some set price. Guess you'll have to try a few things and see what works.

yeah, hopefully with more practice i can speed up my modeling workflow, working it out for just model time + filament put it about £60-70 (for an 80mm bust not factoring electricity and machine time, but id just probably write them off for starters, my biggest issue is getting something that the machine/ tech cant do or me just not being able to model it,

lithographs are a bit easier to do, just awaiting some usb led bars from overseas

Cool, I hope you have better luck then I did with 3d :P