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Why a 3D print costs more than the plastic
When a print finishes, the spool looks only a little lighter, so the job feels almost free. That feeling is misleading. A real print consumes filament, electricity, machine hours, and a share of the printer itself. It also carries a risk: some prints fail, and the failed ones still cost material and time. If you sell prints, give quotes, or just want to know what your hobby costs, you need all four parts in the number, not only the plastic.
The tool above adds those parts for you. Enter the weight of filament the job used, what the filament costs per kilogram, how long the print ran, and how much power your printer draws. Add the price of the printer and how many hours you expect it to last, plus a small allowance for failed prints. The result is a cost breakdown you can actually explain to a customer or to yourself.
The four parts of a print’s cost
Filament is the easiest part. Weigh the finished print, or read the slicer’s filament estimate, and multiply by the price per kilogram. A 100-gram print from a 25-per-kilogram spool costs 2.50 in material. That is the floor of the price, never the whole price.
Electricity is the part most people forget. A typical desktop printer draws between 100 and 200 watts while printing, and a long print can run for ten hours or more. At 0.30 per kilowatt-hour, a five-hour print at 150 watts costs about 0.23 in power. That is small next to the filament, but it adds up over dozens of prints, and heated beds and enclosures push it higher.
Printer wear is the quiet cost. Nozzles wear out, belts stretch, fans fail, and one day the whole machine is replaced. Spreading the purchase price over the machine’s expected printing life gives a fair hourly rate. A 400 printer expected to last 2,000 hours costs 0.20 per printing hour. A five-hour print therefore carries 1.00 of wear.
Failed prints are the honest cost. Supports collapse, first layers lift, and power cuts happen. If roughly one print in ten fails, every successful print must carry about 11 percent extra to cover the wasted ones. The tool applies this as a failure allowance so your price survives contact with reality.
How to measure your real numbers
Start with the slicer, but check it. Slicer weight estimates are usually close, yet they ignore skirts, brims, and purged material. Weighing a finished print on a kitchen scale is more honest. For power, a plug-in power meter is cheap and far better than guessing: run one typical print and note the average watts, since heated-bed printers draw much more in the first hour than later.
Print time also deserves a check. Slicer times assume your printer reaches its set speeds, which is not always true on complex shapes. Log the real start and finish times of a few prints and use the average. Small errors here matter little for one print, but they compound when you quote a batch of fifty.
A worked example
Take a 100-gram print that runs five hours on a 150-watt printer, with electricity at 0.30 per kilowatt-hour, a 400 printer lasting 2,000 hours, and a 10 percent failure allowance. Filament costs 2.50, electricity 0.23, and wear 1.00, giving a subtotal of 3.73. The failure allowance lifts the total to about 4.14. Notice how wear is nearly half the filament cost: ignoring it would underprice the job by almost a third.
Change one input and the story changes. A slower, heavier print at 300 grams and twelve hours costs far more in power and wear than in extra plastic. A tiny, fast print is dominated by wear and failure risk. That is why a flat per-gram price always misleads: it fits medium prints and fails at both extremes.
How to bring the cost down
Use less material before you buy cheaper material. Lower infill where strength allows, hollow thick parts, and orient the model to cut supports. Each gram saved also saves a little print time. Next, print in batches: a full build plate shares the warm-up energy across many parts, and the wear per part falls too.
Finally, protect the failure rate. A clean bed, dry filament, and a first-layer check in the first ten minutes prevent most failures. A failed print avoided is worth more than any discount on a spool, because it saves material, power, and hours at once.
If you sell your prints
Cost is not price. Once you know the cost, add your design time, finishing time, packaging, and a margin for your skill. Many sellers also charge a setup fee for small orders, because the fixed work of slicing and starting a print does not shrink with the part. Quote from the estimator, then add those human costs on top, and write the breakdown down so repeat orders stay consistent.
Remember the framing of this tool: it is an educational estimator, not a business plan. Your filament brand, printer, and electricity tariff decide the real numbers, and your printer manufacturer’s guidance governs settings and safety. Use the estimator to learn your costs, check them against a few real prints, and adjust the inputs until the estimates match your workshop.