Gemini 3 Deep Think

by Google · Updated February 15, 2026

Gemini 3 Deep Think is Google DeepMind's advanced reasoning mode that can analyze rough sketches, 2D images, and photographs of real-world objects, then generate detailed 3D blueprints ready for 3D printing. Designs can be iteratively refined through natural language prompts without requiring manual CAD work, dramatically compressing the design-to-print cycle. Available to Google AI Ultra subscribers and through the Gemini API for selected researchers and engineers.

Best For

Sketch to 3DSTL generation3D printingRapid prototypingCAD-free design

Prompting Tips

1Upload clear, well-lit sketches or photos with distinct edges for best results
2Include multiple views (front, side, top) of your object for more accurate 3D reconstruction
3Use natural language to refine: "make the walls thicker" or "add a flat base for printing"
4Specify intended print material (PLA, resin, PETG) for appropriate wall thickness suggestions
5Ask for "watertight mesh" to ensure the output STL is print-ready without manual repair
6Start with simple geometric objects before attempting complex organic shapes

Syntax & Constraints

Upload an image or sketch, then describe the 3D object you want. Supports iterative refinement through conversation. Outputs STL-compatible 3D geometry. Available in Deep Think mode through the Gemini app (AI Ultra subscription required).

Example Prompts

◆ Logo Design

2D logo to 3D-printable badge

Convert this 2D logo sketch into a 3D-printable badge. Make it 5cm wide, 3mm thick, with the logo embossed 1mm above the base. Add a flat back for easy adhesion. Output as a solid, watertight mesh.

logo3d-printemboss

Hand-drawn text to 3D nameplate

Create a 3D desk nameplate from this hand-drawn text. The letters should be raised 2mm on a rounded-edge rectangular base, 12cm wide by 3cm tall by 1.5cm deep. Ensure the base is flat for stable standing.

textdesk3d-print