Waypoint RealmsHelp center
Back to app
Help topics

Fit Forge: resizing an STL to your body

Somebody else modelled that helmet on somebody else's head. Upload the STL, pick what it is, and Fit Forge scales it to your measurements in your browser.

EveryoneUpdated August 28, 2026

Most cosplay STLs on the internet were modelled on the maker's own head, or on nobody in particular. Fit Forge takes one of those files and scales it to your measurements before you spend forty hours of printer time on it.

Fit Forge asking what you are fitting with options for helmet, gauntlet, boot, chestplate, greaves, prop and other, showing which body it is measuring against, and an upload control for an STL.
Pick what the piece is, and Fit Forge knows which measurement has to clear.

Using it

  1. Say what the piece is

    Helmet, gauntlet, boot, chestplate, greaves, prop or other. This is not a label — it is how the forge knows which measurement has to clear. A helmet is fitted against your head circumference, a gauntlet against your forearm, greaves against your calf.

  2. Check the body it is measuring against

    The panel names the profile it is using and the measurement that piece needs. If that measurement is missing it says not measured and offers to take it — see the Measuring Room.

  3. Upload the STL

    Any orientation — the forge works out which end the opening is on. Dimensions are read in millimetres.

  4. Scale and export

    Check the preview, then export the resized file for your slicer.

The file never leaves your browser

The STL is read and rescaled on your own device. It is not uploaded to Waypoint, and we never hold a copy of a model you did not make.

Scaling is not the same as fitting

Fit Forge scales the geometry so the critical measurement clears. It cannot know that the original had no room for padding, or that your ears sit differently. Print a test ring before committing a full helmet — cheap plastic beats a weekend.

Costing the build

On Adept and Archmage, Fit Forge also prices the piece: it works out material use from the scaled model and produces a bill of materials, so you know what a print costs before you start it. Scaling itself is open to everyone.

If you are making the piece from scratch

Fit Forge resizes a model somebody else made. To model one yourself — and unfold it into foam templates — use Piece Forge instead; see printing foam templates.

Still stuck? Browse all help or contact us. To report someone or something, use the report action on the relevant profile, post, or session — it sends us the context automatically.