Turn any STL into a two-part mold. In your browser.
Upload your 3D model, get a print-ready mold in seconds. No CAD skills, no software to install, no learning curve. Print it, pour your silicone or resin, and cast.
From STL to cast-ready mold in three steps
Upload
Drop in any STL. Mold Studio automatically checks and repairs your mesh, so even imperfect models just work.
Generate
The mold is built around your model's geometry: two halves with registration keys and a pour spout. Preview before you download.
Print & cast
Download both halves, print them on any FDM or resin printer, clamp them together, and pour. Alignment keys keep every cast identical.
Built for makers, not CAD experts
Made for casting, not CAD
Making a mold in Blender or Fusion takes hours of boolean-operation patience. Mold Studio does the geometry for you — you only decide the things that matter for your cast.
Runs in the browser
Nothing to install, nothing to update, works on any OS.
Registration keys built in
Matching alignment keys on the parting surface lock the halves together the same way every time. Repeatable casts, no shifted seam lines.
Know your silicone cost upfront
Mold Studio calculates the exact silicone volume your mold needs — in cm³ and grams — before you print anything.
Hollow casts with inner cores
Casting a vase or any hollow piece? Generate a matching inner core that seats from the top and defines your wall thickness.
Your models stay yours
Uploaded STL files are stored only to generate your mold and are not sold or shared with third parties. You can use the tool without an account.
Pricing
The mold generator is free to try. Credit packs unlock more generations. One credit = one mold generation. One-time payment — no subscription.
10 Molds
- 10 mold generations
- Box, form-fitting and silicone modes
- Credits never expire
25 Molds
- 25 mold generations
- Box, form-fitting and silicone modes
- Credits never expire
60 Molds
- 60 mold generations
- Box, form-fitting and silicone modes
- Credits never expire
Unlimited
- Ongoing access for as long as the service operates
- Box, form-fitting and silicone modes
- Fair use: up to 50 mold generations per month
- Individual, non-automated use only
All prices in USD. One-time payment, no subscription. Payments are processed by Lemon Squeezy, our authorised reseller and Merchant of Record. Unlimited access is subject to fair use — see our Terms.
Makers who need duplicate parts
Miniature & tabletop makers
Duplicate detailed miniatures and terrain pieces without re-printing every copy.
Candle & soap crafters
Turn a master shape into a reusable mold for batch pours.
Cosplay & prop builders
Cast lightweight armor and prop parts in silicone or resin from a single sculpted master.
Product designers
Soft-tool prototypes fast — test form and fit before committing to hard tooling.