A 3D printer earns nothing while it sits idle.

Before any route makes sense you need the cost of a print, because almost every disappointing 3D printing side income is a pricing mistake rather than a sales one. There are four costs, and only one of them is filament.

• Filament. A kilo of PLA is roughly £14 to £20 in the UK, so 1.4p to 2p a gram. A print that weighs 70 g costs about £1.00 to £1.40 in plastic. This is the cost everyone counts.
• Power. A 0.4 nozzle machine with a heated bed averages somewhere around 100 to 150 W over a long print. Five hours is about 0.6 kWh, so at Ofgem's capped rate for October to December 2026, 26.32p, that is roughly 16p. Real, but small.
• Failures and consumables. Budget a failure rate. One print in fifteen going wrong adds about 7% to every job, and nozzles, build plates, belts and the odd spool of unusable filament sit on top of that.
• Your time. Not the print time — the printer does that on its own — but the minutes that need you: slicing, plate changes, filament swaps at a colour pause, removing supports, deburring, gluing, packing, posting, answering the buyer's message. This is the cost that decides whether a route is worth doing.

The useful question is not what a print costs. It is what an hour of your attention earns, because your printer has far more hours than you do.

Work both out once, write them down, and you can judge any offer in a minute. We go through it properly in what a print costs you, and what to charge.

Two of those four are local, and more local than people expect: electricity in Ireland costs well over twice what it costs in Hungary, and what you owe on what you earn is a different rule in every country. So the arithmetic is written out separately in pounds for the United Kingdom, and in euros for Ireland, Spain, Germany, France, Italy and the Netherlands.

Every honest answer to this question comes down to five routes. They differ less in what they pay per print than in how much selling you have to do before anybody pays you anything.

Notice what the table does not say. Nothing here pays well per hour of your attention, and nothing becomes passive. What varies is whether you are paid for selling or paid for printing. If what you have spare is machine time rather than evenings, the bottom two rows are the only two worth reading twice, and print on demand with your own printer explains how they work in practice.

Search the question and you get the same lists: phone stands, planters, cable clips, dragons, desk organisers, cosplay props. They are not lies. They are just answers to a different question, which is what has sold on Etsy, and they leave out the part that decides whether you make money.

• They ignore the market they create. The moment a list names an item, several thousand printer owners list it. The articulated dragon sold brilliantly for the people printing it in 2023 and sells for £6 against free postage today.
• They quote the sale price, not the margin. A £12 planter is 300 g of filament, 9 hours of plate time, a box, and £3 of postage. Read the margin, not the price.
• They assume you can be found. A new Etsy listing in a saturated category is not a shop. It is a lottery ticket with a listing fee.
• They never count your evening. Fifty small items a month means fifty packets, fifty labels and fifty trips to the Post Office.

The things that reliably sell are the things that are hard to find, specific to someone, or needed urgently — not the things that are easy to print.

There is a better filter than any list, and we set it out in what actually sells when you print to order.

Nothing in this clarifies until money has changed hands once. The quickest way there has nothing to do with building a brand.

• Work out your cost per gram and your cost per printer hour, from your own spool price and tariff.
• Print something for someone who already knows you: a broken bracket, a sign for a shop you use, a part for a friend's bike. Charge for it, even a little, so that you learn to quote.
• Pick one route from the table above and give it a month of real attention. Not five routes at once.
• If the appeal was always the machine rather than the shop, apply somewhere that pays per unit, so the printing is the job and somebody else does the selling.

Then raise your prices. Almost everybody starts too cheap, discovers the work is not worth it, and concludes that 3D printing does not pay, when what did not pay was their first guess at a price.