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3D Print Math

Free browser-based calculators for scaling, referencing, weighing, and calculating costs for STL conversions for tabletop miniatures. Check whether a spool has enough filament for a print before you even open your slicer. Whether you are printing sci-fi epic armies, fantasy RPG monsters, or WWII infantry, these tools help you avoid wasted filament. All tools run client-side — no uploads, no accounts, no cookies.

Featured tool

STL Scale Converter

The main STL scale calculator I use before every print. Select source and target scales, choose eye-level or top-of-head, and get the exact slicer percentage for every tabletop scale, from 6mm epic to 32mm heroic and beyond.

Use the tool
16+ gaming scales Eye Level & Top of Head FDM-optimized percentages No upload, no login

Calculators

Slicer Percentage Calculator

Type in two measurements in millimetres, get the exact percentage for your slicer. Works for any scale combination.

  • Any source size to any target size
  • Real-time calculation as you type
  • 12 common conversion presets
  • Formula breakdown for verification
  • Copy result to clipboard
  • Zero bloat — no account, no cookies

Filament Cost Calculator

Know your print cost before you start. Enter filament price, weight used, and optional electricity to estimate the true cost of 3D printing miniatures.

  • Real-time cost calculation
  • Filament cost per print
  • Optional electricity cost estimate
  • Filament presets with real market prices
  • Deep-link from scale engine
  • No account, no cookies

Filament Density Calculator

Enter dimensions or a volume, pick a material, and get the weight in grams before you open your slicer. PLA, PETG, ABS, resin, and more.

  • 12 material densities plus custom density
  • Box, cylinder, sphere, and tube shapes
  • Hollow shell math with wall thickness and infill
  • Direct volume input in cm³ or mL
  • Prints per spool and cost estimate
  • Print time baseline by quality preset

EU Import & Landed Cost Calculator

The true landed cost in EUR for 3D printing supplies shipped into the EU — item price, shipping, the €3 per-item customs duty, and import VAT for your country.

  • €3 flat customs duty per item category
  • Import VAT for all 27 EU member states
  • Correct VAT base: item + shipping + duty
  • Over-€150 orders with custom duty rate
  • Instant landed-cost breakdown in EUR
  • No account, no cookies — nothing uploaded

Resin Shrinkage Calculator

Calculate exact dimensional scaling compensation for resin and FDM 3D printing. Prevent shrinkage distortion and ensure precise part-to-part fitting.

  • 13 resin and filament shrink presets
  • Separate XY and Z compensation
  • Measured test coupon back-solve mode
  • Exact 1÷k inverse, not the naive 1+s
  • Fit clearance for press and slide fits
  • Copy the scale percentage to clipboard

Miniature Resin Weight & Cost Calculator

Calculate exact resin weight, material volume, and printing cost for tabletop miniatures. Input your bottle price and model mL for instant pricing.

  • Box, cylinder, and sphere volume math
  • Hollowed shell with wall thickness and solid base
  • Direct volume input from Chitubox or Lychee
  • 6 bottle presets with per-mL cost rates
  • Army planner for N miniatures at once
  • Weight in grams as a hollowing sanity check

Reference Data

Scale Reference Bar Generator

Generate a printable ruler bar at any tabletop scale and import it into Lychee or Chitubox to measure unknown STLs. Download the STL right in your browser.

  • Downloadable STL, generated in your browser
  • All 16 tabletop scales supported
  • 5mm tick marks plus a figure-height end tab
  • Ruler lengths from 30 to 100mm
  • No uploads, no accounts, no cookies

Layer Resolution & Angle Calculator

Calculate optimal layer height, Z-axis resolution, and surface stair-stepping angles for FDM and resin 3D printing precision.

  • Layer count from model height
  • Step riser, tread, and facet geometry
  • Worst-case faceting at 45° surfaces
  • Sanding effort estimate per layer height
  • Max unsupported overhang for 7 materials
  • MSLA LCD pixel pitch for resin XY detail
All tools included

Built for miniature 3D printing

Every tool on STLACCESS is built around one problem I kept running into: getting the right scale for 3D printed tabletop miniatures. The calculator and reference library work together so you can convert and share scale percentages — all from your browser, all for free.

  • STL Scale Engine — The main calculator for converting between any supported scales
  • Miniature Size Chart — 46 verified conversion percentages with print-tested results