Mold Studio — free 3D-printable mold generator: STL to mold in your browser
[ MOLD STUDIO / FREE BROWSER TOOL ]
Any model. Print-ready mold. Seconds.
Drop in an STL, get back a watertight mold you can print today — two-part blocks with pour funnels and air vents, silicone and plaster formwork, vase & planter kits with inner cores, bath-bomb presses, pour molds and cavity trays. Unlimited and free. Your files stay on your device.
[ 01 / HOW IT WORKS ]
From file to mold in four moves
01
Drop in your model
STL or OBJ, in millimetres. Everything is computed on your own device — the file is never uploaded anywhere.
02
Pick the mold
Seven generators: two-part block, silicone or plaster formwork, vase & planter core kit, bath-bomb press, open pour mold and multi-cavity tray — with live seam and undercut checks.
03
Tune and generate
Walls, pour funnel, registration fit, shrinkage compensation. The engine builds watertight, print-ready halves in seconds.
04
Print it — or let us
Download the STLs for your own printer, or send the mold to our studio and we'll FDM-print and ship it across India.
[ 02 / ENGINEERED, NOT GUESSED ]
Mold logic other generators skip
Mold Studio was built by a fabrication studio that prints and pours molds every week — the defaults are the ones we use on our own floor.
Pour spouts that actually land
The funnel is drilled to your model's real surface, found by probing the geometry — not dropped blindly from the bounding box and hoping it connects.
Live undercut check
Facets that would lock a rigid cast glow orange while you rotate the model and slide the seam — before you spend a gram of filament.
Printable by construction
Every part comes out of a watertight geometry kernel, laid flat for the bed, with registration clearance matched to FDM tolerances.
[ 03 / FAQ ]
Molding questions, answered
What file formats does the mold generator accept?
Binary and ASCII STL, plus OBJ, up to 100 MB. Files are parsed and processed entirely in your browser — nothing is uploaded to a server.
Is Mold Studio really free?
Yes — unlimited generations and downloads, no account, no watermarks. If you don't own a printer, we offer paid FDM printing of your mold from our Kozhikode studio.
Which mold type should I choose?
Two-part molds suit fully 3D shapes cast in wax, soap or resin. Silicone formwork prints a housing you fill with liquid silicone around your master — best for detailed or undercut parts; the plaster variant makes slip-casting molds for ceramics. The vase & planter kit adds an inner core so pots cast hollow, the bath-bomb press makes two packing cups, open pour blocks suit flat-backed shapes, and multi-cavity trays batch small casts like chocolates, ice or wax melts.
My model isn't watertight — will it work?
Mold generation needs a watertight (manifold) mesh. If your file has holes, run it through your slicer's repair function or an online STL repair, then re-upload. The studio tells you when this is the problem.
Can I cast food in these molds?
Not directly — 3D-printed plastic is not food-safe. Print the tray or mold, then cast food-grade silicone over it, and use that silicone mold for chocolate, ice or gummies.
How do the mold halves stay aligned?
You choose tapered registration pins or a tongue-and-groove frame, both generated with real printing clearance (0.15–0.4 mm) so the halves click together without slop and thin liquids can't weep through the seam.