About
Free tools that turn a 3D model into a ready-to-print project, tuned for what the part is for.
Who we are
Print Prep is built and run by FS Engineering LLC, a small engineering and design shop in Maine. We print a lot, we got tired of tuning the same settings by hand, and we made the tool we wanted.
How it works
- Speed: print faster, automatically. Mark anything that can’t change and we tune the rest.
- Cosmetic: show-quality finish, still fast. Mark the A surfaces and they get ironing and finer layers.
- Functional: strong parts, printed smart. Define the fixed features and the external forces, and we orient the part and add walls and infill only as needed.
- Filament Finder: filament prices from the brands’ own stores, updated daily.
Disclaimer
Print Prep is provided free and as is, without warranty of any kind. Print times, filament amounts, strength results and stress maps are estimates from simplified models. Real prints depend on your printer, filament, settings and conditions.
Print Prep is not a design guide. It tunes print settings to match the part’s application. It does not certify that a part is safe or strong enough. Don’t use it for parts where a failure could hurt someone or damage property (anything that holds weight overhead, climbing, vehicle, medical or child-safety parts) without proper engineering and testing.
Always check the project in your slicer before printing. You are responsible for what you print and how you use it. To the fullest extent allowed by law, FS Engineering LLC is not liable for failed prints, damage to printers or property, or any injury or loss from using this site or the files it makes.
Prices and stock on Filament Finder come from the stores’ public listings and can change at any time. Always check the store’s page before you buy. Some links may be affiliate links: if you buy through them, we may earn a small commission at no extra cost to you.
Print Prep is an independent project and is not affiliated with, endorsed by or sponsored by Bambu Lab, OrcaSlicer or any filament brand. Printer and brand names are used only to describe compatibility, and are trademarks of their owners.
Feedback
Found a bug, a weird result, or have an idea? Tell us. We read everything.
Please don’t attach or paste private files. We only see what you type here.
Open source
Print Prep is built on open source software. Thank you to these projects:
| three.js | 3D viewer | MIT |
| manifold | splitting parts | Apache 2.0 |
| occt-import-js / Open CASCADE | reading STEP files | LGPL 2.1, LGPL 2.1 |
| fflate | writing 3MF files | MIT |
| Printer profiles | printer, process and filament settings | AGPL 3.0 |
The printer profiles in profiles/ are derived from the system presets of OrcaSlicer and Bambu Studio, which are licensed under the GNU Affero General Public License v3.0. Our modified versions are published here in full, in their original JSON form, under the same license.
© 2026 FS Engineering LLC