Free 3D printing calculators that show their working
Spoolab is a set of fast, no-sign-up tools for 3D printing hobbyists and sellers. Every formula is explained and every default is sourced.
Budget 3D Printer PickerAnswer 4 questions and get 3 printers that fit your budget and goals.3D Print Cost CalculatorFilament, electricity, machine wear and failures in one true cost per print.Filament Length ↔ WeightConvert grams to metres (and back) for 1.75 and 2.85 mm filament.Flow Rate / Extrusion MultiplierFix over- or under-extrusion from caliper wall measurements or an OrcaSlicer flow test.AMS / Multi-Colour Purge WasteSee how many grams and how much money colour changes waste.3D Printer Electricity CostEnergy use per print and per month, with real Bambu Lab wattages.
Why Spoolab?
- Transparent maths — each tool shows its formula and a worked example.
- Sourced defaults — densities from manufacturer data sheets, wattages from the Bambu Lab wiki.
- Private — everything runs in your browser. No accounts, no tracking cookies.
More tools are on the way: e-steps / rotation distance, resin cost, volumetric speed and a spool-remaining calculator.