Free No account needed

Flexifier

Turn a simple image into a print-in-place flexi toy with hinges or ball joints

Flexifier is a free browser tool for bendy fidget toys from a simple drawing or silhouette. Free to use with no account; the developer asks for optional PayPal donations. Exports STL and STEP. Last checked 26 September 2026.

Open Flexifier See alternatives

Opens flexifier.streamlit.app

At a glance

Price: Free to use with no account; the developer asks for optional PayPal donations.
Runs on: Browser
Exports: STL, STEP
Multicolor: No, single color
Account: Not needed
Open source: Yes
Skill level: Easy: a few settings to tune
Best for: Bendy fidget toys from a simple drawing or silhouette
Selling prints: Not allowed The Printables page and the GitHub README put the project's models under CC BY-NC-SA 4.0, which does not allow commercial use; neither says anything separate about files you generate.
How we checked: Opened the generator Page loads without an account: input type (PNG, JPG, SVG), STL or STEP output, slider or number mode and an upload box; hinge controls appear after upload
Last checked: 26 September 2026

Open generator

Sources: GitHub repository and licence, Printables project page (checked 26 September 2026)

Something out of date? Let us know

Made Flexifier? Get the listing badge

What is Flexifier?

Flexifier is a free, open-source browser tool that turns a picture into a print-in-place flexi model. You upload a PNG, JPG or SVG, the app traces it into a flat outline and extrudes it to the height you pick. Then you add joints one at a time, either a regular hinge or a ball joint, which the developer says can turn a full 360 degrees. For each joint you set its position, angle and diameter, plus the width and length of the cut through the shape.

Every change redraws a flat top-view preview, with each joint marked in its own color. When the layout looks right you press Render and download the model as STL or STEP. The sliders can be swapped for number boxes when you want exact values. The project's Printables page, with more than 1,000 likes, also hosts Windows and macOS downloads, though recent comments there report the macOS version failing to open.

It suits makers who want a bendy fidget toy, animal or logo from a clean silhouette and do not mind some trial and error. Detailed photos trace poorly, joints are placed with sliders rather than by clicking, and the free hosting can be asleep or overloaded when you arrive.

What you can make

Print-in-place flexi animals and figures
Hinged fidget toys
Ball-joint flexi models
Flexi versions of logos and silhouettes

How to use Flexifier

Open the app and choose the input and output file types
Upload a clear PNG, JPG or SVG and set the model height
Add hinges or ball joints and slide each one into place on the preview
Press Render, then download the STL or STEP file
Print it in one piece and gently work the joints loose

What you'll need to print it

Filament and parts that suit what you make with Flexifier.

Matte PLA

Multicolor PLA

6 x 2 mm magnets

Also handy

Print removal and cleanup tools

Bambu Lab Print Finishing Kit Bambu Lab
Bambu Lab Maker's Supply ESD Stainless Steel Tweezers Set Bambu Lab

Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that

Flexifier pros

Free and open source, with no sign-up
Two joint types: regular hinges and ball joints
Exports STEP as well as STL, and offers number boxes for exact placement

Flexifier cons

Joints are positioned with sliders on a flat preview, so expect some trial and error
Busy photos trace badly; clean, high-contrast silhouettes work best
Runs on free shared hosting that the developer says often hits its limits, and the code has not changed since early 2025