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Free tool

Filament cost calculator

Enter what you paid for a spool and what one print uses. The calculator gives you the cost per gram, the cost of the print and a selling price with your margin on top.

A finished NOVTAU filament spool on the scale before packing

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Filament

What you paid for one spool, shipping included if you want it counted.

A standard spool holds 1,000 g. Change it if you buy 3 kg or 5 kg spools.

Take the weight from your slicer, supports and purge included.

Optional. The share of material you lose to failed prints.

Printer time and power

Optional. Read it from a plug-in power meter for the most accurate figure.

Labour and margin

Optional. Plate removal, cleanup, packing.

Your numbers

Fill in spool price, spool weight and filament used to see the result.

How the numbers are worked out

Every line is plain arithmetic, so you can check it against your own spreadsheet.

  1. Cost per gram = spool price ÷ net filament weight.

  2. Filament per print = grams used × cost per gram, raised by your failure rate.

  3. Electricity per print = power draw in kW × print hours × price per kWh.

  4. Labour per print = hands-on minutes ÷ 60 × hourly rate.

  5. Selling price = total cost × (1 + margin ÷ 100).

Where the cost moves on a print farm

On most farm parts, filament is the largest line. These are the levers that change it.

Spool price per kilo

Buying by the carton instead of by the spool lowers the cost per gram on every part you print. Compare offers per kilo of net filament, not per spool.

Spool size

Larger spools mean fewer changes and less leftover filament at the end of each spool. Check that your printers and dryers take the size before you switch.

Failed prints

Wet or uneven filament shows up as stringing, gaps and failed plates. A spool that stays dry and in tolerance keeps the failure rate, and the real cost per part, down.

Supports and purge

Supports, brims and color-change purge are filament you pay for but do not sell. Weigh them in the slicer estimate so the price covers them.

Questions about filament cost

How do I work out filament cost per gram?

Divide what you paid for the spool by the net filament weight in grams. A 1,000 g spool is the common size, so the cost per gram is the spool price divided by 1,000.

How much does a 3D print cost in electricity?

Multiply the printer's average power draw in kilowatts by the print time in hours and by your price per kWh. A plug-in power meter gives you the real draw for your machine and settings.

What margin should I add when I sell prints?

There is no single answer. Start from the total cost per print, including failures and hands-on time, then set a margin that covers your overheads and matches what buyers in your market pay.

Does buying filament in bulk change the cost per print?

Yes. The filament line scales with the price per kilo, so a lower bulk price per kilo lowers the cost of every print. Mixed cartons let a farm buy several materials and colors in one order.

Buying filament by the carton?

Stock orders start at 100 spools and can mix colors and materials. Tell us your monthly use and we quote per kilo.