Free Flexi / Articulated Model Creator — AI 3D Generator + Print-in-Place Joint Tool
Generate a 3D model from a text description or a photo with AI, or upload your own STL. Then click to place flexi joints, auto-size the cutters, and download a ready-to-print cut model. Create articulated, print-in-place flexi figures — no modeling skills needed. 100% free to use in your browser.
Generate a 3D Model with AI
No model yet? Just describe your item in text or upload a photo, and our AI generates a clean, ready-to-articulate 3D model for you. Generation runs in the background, so you can leave the page and come back when it's done — all your generations are saved in your history.
What Are Flexi / Articulated Models?
Flexi or articulated models are 3D prints with built-in joints that move freely after printing. They're printed in one piece — no assembly required. Popular examples include flexi dragons, articulated animals, and flexible phone stands.
How the Cutter System Works
The cutter is a Saturn-shaped piece with a ball-and-socket profile. When you boolean subtract it from your model, it creates two interlocking parts that can rotate freely. The ring creates the socket, the sphere creates the ball joint.
Automatic Sizing & Orientation
When you click on your model, the tool calculates the surface normal and local cross-section, then automatically orients and sizes the cutter to fit. You can fine-tune the scale, position offset, and rotation afterward.
Works With Any Slicer
Export the cutters as STL, then import both your original model and the cutters into Blender, Meshmixer, or any CAD tool that supports boolean operations. Subtract the cutters to create the articulated joints, then slice and print.
Popular Use Cases
Flexi Dragons & Animals
The most popular articulated 3D prints. Place joints along a dragon or snake body to create a flexible, poseable figure that prints in one piece.
Articulated Action Figures & Toys
Create poseable figurines with joints at the shoulders, elbows, hips, and knees. Print-in-place joints mean zero assembly for your customers.
Flexible Phone Stands & Holders
Make adjustable phone stands, tablet holders, and desk accessories with articulated segments that lock in position through friction.
Etsy & Online Sales
Articulated and flexi models are among the top-selling 3D print categories on Etsy. Flexi dragons, dinosaurs, and animals consistently rank in the top sellers.
Frequently Asked Questions
Can I generate a 3D model from text or an image?
Yes. Open the AI panel, then either describe your item in words or upload a photo. Our AI conditions the image and generates a 3D model optimized for placing flexi joints. Generation runs in the background — you can close the tab and return later, and finished models are kept in your generation history.
Do AI generations include the flexi joints?
No — the AI generates a clean base model without joints. You add and position the flexi joints yourself in the 3D editor, giving you full control over where your model articulates.
Is this flexi model tool free?
Yes, the joint placement and cutter tools are 100% free with no limits — place as many joints as you want, right in your browser. AI 3D model generation uses your monthly generation allotment or API credits, just like our other AI generators.
How do I use the exported cutters?
Import your original model and the exported cutter STL into Blender (or Meshmixer, TinkerCAD, etc.). Use a boolean difference/subtract operation to cut the joints into your model. The result is a print-in-place articulated model.
What printer settings work best?
Print at 0.2mm layer height with 2-3 walls. Use a 0.1-0.15mm gap between joint parts (most slicers default to this). PLA, PETG, and TPU all work well. Supports are generally not needed if joints are oriented correctly.
Can I adjust the joint size?
Yes. Each joint has individual scale, position, and rotation controls. The tool auto-sizes to slightly larger than the model cross-section, but you can manually scale from 50% to 300%.
Create custom 3D models with AI
PrintPal AI creates fully custom 3D models from any description — dragons, figurines, functional parts, and more.
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