Calculatorscost & calibrationAll 14 tools
3D printing calculators
Cost and price of a print, what Etsy leaves you, filament left on a spool, and the three calibrations people look up most. Everything updates as you type, nothing is saved or sent anywhere.
Print cost & price
What one print really costs — filament, electricity, wear, failures and your time — and a price to sell it at. The formulas and a worked example: How much does a 3D print cost?
For the real wattage, a plug-in power meter; for grams, a kitchen scale; and filament: PLA or PETG, 1 kg (Amazon).
Selling on Etsy: fees & profit
Etsy's US fees on one order and what you keep. Rates from Etsy's fee and payments policies, checked 9 November 2026 (US bank account).
Filament left on a spool
Weigh the spool; get grams and metres left, and whether it will finish a print.
Weigh it on a kitchen scale that reads to 1 g or better (Amazon).
Weigh an empty spool of the same brand once and keep the number — spools differ a lot between brands and between plastic and cardboard.
Length ↔ weight
Shrinkage & scale fix
Measure a printed part of known size; get the scale to set in the slicer for each axis.
Measure with digital calipers (Amazon); a ruler is not precise enough.
Flow rate & e-steps
Two calibrations: the slicer's flow (extrusion multiplier) from a measured wall, and the extruder's e-steps or rotation distance from a measured length. Step by step, with OrcaSlicer and Bambu Studio: Flow rate and e-steps calibration.
You need digital calipers for the wall and the mark (Amazon).
Flow from a wall
E-steps / rotation distance
Volumetric flow
How much plastic per second a speed asks of the hotend — or the fastest speed it allows.
Your slicer's filament profile has a "max volumetric speed": use that as the limit.
New — 9 November 2026. Written by Ned Walsch. Found a number that looks off? Tell me.
Frequently asked questions
How do I work out what a 3D print costs?
Add up five things: filament (grams × price per gram), electricity (printer watts × hours × your price per kWh), wear on the printer (its price spread over the hours you expect it to run, plus spare parts), an allowance for failed prints, and your time if you count it. The print cost calculator does this; drop an STL into it for a filament estimate, or type the grams your slicer shows.
How much does Etsy take from a sale?
For a US seller: $0.20 to list, 6.5 % of the item price plus shipping and gift wrap, and payment processing of 3 % + $0.25 of the whole order including shipping and tax. If the sale came through Etsy's offsite ads, another 15 % (12 % once a shop has made $10,000 in a year), capped at $100 an order. These are Etsy's published rates checked on 9 November 2026; other countries pay different processing fees.
How can I tell how much filament is left on a spool?
Weigh the spool and subtract the weight of an empty spool of the same brand (weigh one once and keep the number — they vary a lot). The spool calculator turns the grams into metres for your filament and diameter and tells you whether it is enough for a print.
How do I calibrate e-steps or rotation distance?
Mark the filament 120 mm above the extruder, extrude 100 mm slowly with the hotend at printing temperature, and measure from the mark again. New e-steps = old e-steps × 100 ÷ the length that actually went in. In Klipper the rotation distance goes the other way: new = old × actually extruded ÷ 100.
Why are my prints the wrong size?
Plastic shrinks a little as it cools — PLA barely, ABS and ASA more, nylon most — and belts or steps can be slightly off. Print a part of a known size, measure it, and set the scale the shrinkage calculator gives (per axis if they differ). For holes and fits, measure on a test piece made of the same material.