Most people who start selling 3D prints think about filament cost and maybe print time. That is usually where the math stops. But filament and time are only part of what a print actually costs you. There is the electricity your printer draws for hours at a time. There is the wear on your nozzle, your bed, your belts. There is the time you spend slicing, cleaning up supports, and packaging the order. There is the filament wasted on failed prints and purge lines. And there is your own time, which is worth something. When you add all of that up honestly, a lot of prints that felt profitable turn out to be close to break even, or worse. I ran into this problem myself and started building a simple spreadsheet to track it properly. That spreadsheet eventually turned into Quotemy, a browser based calculator I decided to make public because I figured other makers were dealing with the same thing.  It lets you enter your filament cost, print time, labor time, hardware like inserts or magnets, packaging, and your machine details. Based on your printer cost, expected lifespan, average uptime, and power draw, it calculates a real hourly machine rate rather than just guessing. The cost breakdown shows you exactly where your money is going, which is often more useful than just the final number. Sometimes you realize your machine cost is negligible and labor is eating everything. Sometimes it is the opposite. It also gives you suggested prices at different margin levels so you can see what competitive, standard, and premium pricing actually looks like for that specific print rather than picking a number out of thin air. It is free, runs entirely in your browser, and does not require an account. You can save quotes during a session and export them as a file to keep them permanently. It is still in active development and I am genuinely looking for feedback from people who actually sell prints. If something feels off, if a field is missing, or if it does not match how you work, I would like to hear it. quotemy.app