Fit a downloaded model to your body

Fit Forge takes a model somebody else made — a helmet off a model site, say — and scales it to your measurements before you spend a day printing it. Everything happens in your browser.

Before you start

Set it up

1. Open Fit Forge

   In the Cosplay Realm's rail, choose Fit Forge (under The Workshop).

2. Say what you're fitting

   Under What are you fitting?, tap the kind: Helmet, Vambrace, Boot, Chestplate, Greaves, Pauldron, Bracer, Mask, Belt, Back plate, Prop or Other. It decides which measurement has to clear — head for a helmet or mask, forearm for a vambrace or bracer, calf for boots and greaves, chest for a chestplate or back plate, waist for a belt.

3. Check the body card

   Measuring against names your profile and the measurement, with how it was taken and how old it is. If it reads not measured, press Measure it →, measure, and come back with Back to Fit Forge →.

4. Upload the model

   Choose the file under Upload a model. It reads This file currently fits roughly a … circumference.

5. Check the fit axis

   Under Fit axis, Fit Forge says which way it thinks the piece is worn — Detected from the mesh: the … axis, opening at the … end. If that's wrong, pick X, Y or Z, or flip the opening's end.

Set the fit

1. Target

   Target … circumference (cm) starts at your measurement. For a pauldron, prop or other piece, type the circumference you want.

2. Fit band

   Fit band — how much of the model scales, 20% to 100% (60% to start). Lower, and only the rim that touches you resizes; higher, and the whole model scales.

3. Clearance

   Wearing clearance (cm) — room for padding, a wig, or to move. It starts at 0.2 cm, added all the way round.

4. Preview it

   Press Preview scaled.

Changing any setting clears the scaled preview, so press Preview scaled again — what you download is always what you last looked at. Next: check it before you print.

If something's off

“Enter a target measurement first.”

There's no measurement for this kind in the profile. Type a target, or measure it.

“Couldn't tell which end the opening is on…”

Check the reading looks right and pick the axis yourself.

The model is gone after I measured

Fit Forge never uploads the file, so it isn't kept when you leave the page. Upload it again.

“OBJ files carry no unit…”

The OBJ was tiny in millimetres, so Fit Forge read it as metres. Check the size it reports.

“That glTF couldn't be read…”

Export it from your 3D software as a single .glb, not a .gltf with separate .bin files.