Price is a sum, not a vibe. For a small collectible duck, the number should cover the print, the risk, the packing, and the time you do not get back.
Write down the costs you can see
Material. Weigh a finished duck, or read the slicer estimate, and add the supports and the purge if you print in more than one color. Multiply by what you paid per gram. Keep the spool price and the grams on the spool so the math is yours, not a stranger’s.
Failures. A first-layer fail and a spaghetti bird are part of the job. If one print in a small batch fails, that cost belongs in the price of the ones that ship. Track your own rate. Do not copy a percentage from a forum.
Machine time. You do not have to charge a shop rate, but you should notice hours. A duck that ties up the printer all afternoon is not the same product as a duck that finishes before lunch. Your electricity is a small line. Your evening is not.
Hands. Trim, paint, a magnet, a bag, a mailer, a label. Time these once with a clock, then reuse the number until the process changes.
Fees and postage. Marketplace fees, payment fees, and the mailer are not optional. Quote shipping from a scale, not from memory.
Pick a floor, then look at the shelf
Add those lines. That total is the floor. Below it, you are paying to ship a duck.
Above the floor, look at what is actually for sale next to you: size, finish, paint, and whether the design is yours to sell. A plain single-color duck and a painted character duck are different products. Do not match the cheapest listing if that seller is giving away an unlicensed file or forgetting postage.
Keep the license in the price
A commercial license is a cost of goods when you are selling. If you pay for access to a library, spread that cost across the ducks you actually sell while it is active. Do not invent a giant “brand fee” you cannot explain.
Duck Heroes is not charging for membership yet. When it does, the price will be a real number on the offer, not a guess in a blog post. Until then, price the print you are allowed to sell under whatever license you already hold.
Write the price down
Keep a one-page note per design: grams, hours, packing, fee, price. When filament gets more expensive, you change one line instead of re-feeling the whole shop.
Related: selling legally and Etsy listing basics.