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Other guides

What a 3D print licence tracker doesWhy sellers keep a record of the commercial licences they have bought, and what belongs in one.
Do I need a commercial licence to sell 3D prints?What a commercial licence covers, what it does not, and the four things worth keeping if anyone asks.
My commercial licence lapsed — what now?What actually happens, what to do about stock you have already printed, and how to stop it happening again.
What does a 3D print actually cost to make?Filament is the smallest part. Also covers the failure-rate sum that leaves most people's prices too low.
How to price a 3D printWork out the floor first, then add margin, then subtract what the channel takes.
How much does a 3D printer cost to run per hour?Electricity is the smallest of the three numbers. Depreciation is the largest.
Where your filament actually goesPurge, supports, failures and remnants — the grams you bought that never sold.
How much filament is on a 1kg spool?Metres to grams for every common material, and why the spool always loses more than the slicer said.
What a resin print actually costsWeight against volume, the film and the screen, and the failures an FDM sum does not have.
What to track in a 3D printing inventoryFilament, finished stock and the closing-stock figure — and where the line is between stock and an order book.
How to build a 3D printing business spreadsheetThe three tabs it needs, the columns in each, and the three sums people get wrong.
Selling 3D prints on EtsyWhat Etsy takes from a sale, the fee most people forget, and the permission Etsy never asks for.
What selling 3D prints actually pays youCommission, processing and absorbed postage all come off before you see it.
MakerProof vs a spreadsheetWhat each does well, side by side, and when a spreadsheet is still the right answer.