Questions, answered.

STL (binary and ASCII), OBJ, PLY, and 3MF — including Bambu Studio project files. Modifier volumes, negative parts, and support blockers in Bambu files are excluded automatically so you see only the printable model.

No. Loading, rendering, recording, and video encoding all run inside your browser tab. The only network request the app ever makes for your account is checking a license key. Unreleased or client-confidential models never leave your machine.

Yes. The last model you loaded is kept in your browser’s local storage on your own device, so a refresh — or the return trip from checkout — comes back to your model instead of the starter sample. Only the most recent one is kept, it is never uploaded, and “forget” beside the file name in the app clears it. On a shared or public computer, that is the button to use.

Only in aggregate, with Umami — no cookies, no cross-site identifiers, and nothing that could single you out, which is why there is no consent banner to dismiss. We count page views and a handful of product events (a model loaded, a video recorded, an export saved) with coarse labels like the file extension or the export size. Your file names, the models themselves, your license key, and your email are never part of it.

Everything — every lighting environment, stage, material, export size, and the ray-traced photo mode. Free exports carry a ModelSpin watermark across the frame; paid tiers remove it.

A single-model unlock ($2.99, one-time) removes the watermark for one specific model — identified by the file itself, so re-loading or renaming it keeps the unlock. PRO is a subscription that removes the watermark for every model, on your devices. Both keys go in the same box in the app; it figures out which kind you pasted.

The unlock is tied to the model file itself, not its name — rename it, move it, or load it again later and it still comes through unwatermarked. Re-render it as many times as you like, in any lighting, material, size, or format. If you re-export or modify the file it counts as a new model — reply to your receipt email and we'll sort it out.

Exports simply return to the free watermark when the subscription lapses. Nothing else changes and nothing is lost.

Payments run through Polar, and refund requests are honored through them — reply to your receipt email.

Any modern browser handles the standard renderer. The ray-traced photo mode uses your GPU heavily — a recent laptop or desktop graphics chip gets you a photo in seconds; older machines can stick with the standard engine.

Because they're first-class targets: 4:3 and 3:4 — MakerWorld's default listing sizes — are built into the export menu alongside 16:9, 1:1, and 9:16.