Free + paid plan

Neural4D

AI text and image to watertight STL generator aimed at 3D printing

Neural4D is a freemium browser tool for watertight STL files that slice without repair. Free plan: about 20 models a month, public domain; Go, Plus and Pro cover about 150, 500 or 2,500 models a month (prices did not load in our check). Exports STL, OBJ, GLB, FBX and USDZ; an account is needed to download. Last checked 25 September 2026.

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At a glance

Price: Free plan: about 20 models a month, public domain; Go, Plus and Pro cover about 150, 500 or 2,500 models a month (prices did not load in our check)
Runs on: Browser
Exports: STL, OBJ, GLB, FBX, USDZ
Multicolor: No, single color
Account: Required to download
Open source: No
Skill level: Beginner: fill in a form
Best for: Watertight STL files that slice without repair
Selling prints: Allowed Neural4D's pricing FAQ: free-plan models enter the public domain (N4D asks for credit); paid subscribers own and can sell what they make.
How we checked: Read the tool page and docs Pricing page: free plan about 20 models a month; Part Split and Smart Multicolor are listed on the paid plans
Checked by: Mike Janssen
Last checked: 25 September 2026

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Sources: Neural4D pricing (checked 25 September 2026)

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What is Neural4D?

Neural4D (N4D) is an AI 3D generator whose marketing focuses on printable output. Its Direct3D-S2 engine is designed to produce closed, single-shell meshes without non-manifold edges, which are the usual reason AI models fail in a slicer. You can start from a text prompt or an image and download an STL for Cura, PrusaSlicer or another slicer.

Besides STL it exports OBJ, GLB, FBX, USDZ and a Blender file, so the same model can go into other 3D apps. The company is also building an agent system for wider design tasks, but the text-to-STL and image-to-3D tools are the parts that matter for printing.

There is a free plan with welcome credits, which the pricing table puts at about 20 models a month. Models made on the free plan enter the public domain, while paid subscribers own and can sell what they create. Neural4D suits makers who have been burned by broken AI meshes and want files that slice the first time.