Sorry, I don't mind supporting financially but not over priced 3D printed miniature models. Maybe have another story lined up or something much more worth while? Everyone wants to do 3D models these days but the cost is stupidly expensive and prohibitive, this is not about supporting and artist, its about being ripped off on price and not necessarily from your end, but the actual cost at the user end, it will still cost a stupidly expensive price.
That being said I think 15/20 USD for miniature models is more than enough. Those are the prices I see regularly. The models are small, still have fine details, and you can stand them anywhere. It won't cost anywhere near that to create small 3D printed characters. You just need to choose their clothes then create the colors and then print the little model, using that blueprint people can then create their character in their 3D printer once they've paid for the blueprint.
Also if your planning on printing them yourself and sending them overseas or in the USA/Canada, you wouldn't be paying for the postage it would be down to the person buying the premade model. Then there is insurance to deal with, which would be on you, as the sender. Unless you have a lot of money, as an outlay to start with, I can tell you, it's not worth your time. Your going to be loosing so much money initially, your going to wonder if you will ever make it back. I just wouldn't do it if I where you.
Just concentrate on your game, before even daring to think about doing something like making 3D printed characters from your game. Something could happen that could cause you never to complete the game, that really wouldn't go down well with your fans.
Anyway I wish you well, unfortunately I have not been able to play v0.17 yet, because I lost all of my saves, and I have endless amount of games I promised myself I would get through, then discovered that they all need updating, but I will only do that once I have finished the latest version of a game. I will get to yours again in a few months I think, since I don't have any saves from v.016 or below :(