Free soap mold maker
Design a printable soap mold in your browser, preview it in 3D, and download a print-ready STL or 3MF in seconds. Bars, loaves and embeds - no account, no software to install.
Free · runs entirely in your browser · STL & 3MF download
How it works
- Pick a bar, loaf or upload your own shape - round guest soaps, logos and embed shapes all work.
- Set the size in millimetres and choose an open one-piece mold for flat-topped bars or a two-part mold for shapes with undercuts.
- Preview the mold on a virtual print bed, then download the print-ready STL or 3MF.
What you get
A watertight, print-ready STL or 3MF sized in true millimetres, with a flat base and sensible wall thickness. Two-part molds include alignment keys so the halves register cleanly. Everything is generated on your device - your model never leaves the browser.
Materials & print tips
- Filament: melt-and-pour and cold-process soap cure at low temperatures, so PLA works well. PETG is a good upgrade for repeated batches.
- Wall thickness: 2–3 mm with 3 perimeters keeps the walls from bowing under a full loaf.
- Release & finish: a light coat of mineral oil helps unmold cold-process bars; a 0.16 mm layer height keeps the soap surface smooth. Add a little draft so bars lift out cleanly.
- Lye & safety: printed molds handle cold-process saponification fine - see the guide for tracing, gel phase and curing.
Who it's for
Soap makers, melt-and-pour hobbyists, and small natural-cosmetics shops who want a custom bar shape without CAD. Drop in a logo or pick a shape and you have a printable mold in under a minute. For fine detail or long-running production, print this master and cast a flexible silicone mold from it.
FAQ
Is the soap mold maker free?
Yes. Designing and downloading a soap mold is free and runs entirely in your browser - there is no server render and no account required to start.
Can I pour soap directly into a printed mold?
Yes. Melt-and-pour and cold-process soap both work in printed PLA or PETG molds. A thin coat of mineral oil makes unmolding easier. For the smoothest bar and repeat batches, cast a silicone mold from the print.
What file format do I get?
A standard STL or 3MF that loads straight into any slicer - Cura, PrusaSlicer and others.
Is a printed soap mold safe for cold-process?
Cold-process soap reaches only mild temperatures during saponification, so a sturdy printed mold holds up well. Print thicker walls for big loaves. Full safety and curing detail is in the cold-process soap guide.
Do I need a two-part mold?
Flat-topped bars and loaves only need an open one-piece mold. Choose a two-part mold when your soap has undercuts or a 3D shape - the generator adds the alignment keys automatically.