What I'm going to say may not be popular, but what we do is of limited value. I'd venture to say few of us make a living at this (meanig more don't than do). When you do this as a hobby, a side job, or even if it is your chosen profession, until you're established in the market, you labor and skill have almost no value. If you can find someone to pay what you belive is the right price, that's fine.
As an indivdual, it's unrealistic to believe you can recoup all of your costs. A company that makes a thousand or a million pieces can make each one for far less than you can make a run of a dozen. It's simple economics. If you think you can sell what is essentially the same as a big company provides and do so at your cost, which is substantially greater than that company, you're kidding yourself.
This is a hobby. Chalk up your expenditures to your hobby, and if you actually sell something, it's all good. If you want to make a business of it, you've got a hard road ahead of you. Most small businesses fail within the first two years. Basically, you've got to undercut the compitetion or clearly demonstrate why your product is more desirable and worth more. But not so much more that you price yourself out of the market.