How to use it
- Choose whether you enter grams (most slicers show them) or a length in metres.
- Enter the spool price per kilogram, print time, printer power and electricity price.
- Set an allowance for failed prints and read the total.
How it works
Filament cost = grams ÷ 1000 × price per kg. Electricity = watts ÷ 1000 × hours × price per kWh. Total = (filament + electricity) × (1 + failure allowance). From length: grams = π × (d ÷ 2)² × length × density.
Worked example
50 g of filament at 20 per kg is 1.00. A 4 h 30 min print at 120 W uses 0.54 kWh, and at 0.15 per kWh costs 0.081. With a 5% allowance the total is (1.00 + 0.081) × 1.05 = 1.14.
Tips
- Printer wear, nozzles, build plates and your time are not included. Add them to the price if you sell prints.
- Supports and purge material count too: use the slicer’s total, not just the model weight.