How to use Codex to make a diorama printable
Codex revised a Blender diorama and repaired its mesh for printing. The maker checked the slicer, printed the scene and found remaining scale and detail limits.
note.com
Original prompt
Shared by the source author. See source notes for context.
新規ジオラマ作成
Reach people exploring AI agents
See placements →What happened
The repaired STL was printed in PLA and partly painted. Slicer verification succeeded, but scale choices and fine features still produced visible physical limitations.
Reported by tukimi-sato — noteHow the agent did it
- The author reduced the diorama scope and gave Codex successive visible geometry corrections.
- Codex revised the Blender model and repaired non-manifold edges without filling the intended openings.
- The author checked the STL in the slicer, printed it in PLA and assessed scale and fine detail.
Where a person stepped in
The author reviewed geometry, supplied successive corrections, checked the slicer and physically printed and painted the result.
tukimi-sato used Codex with Blender MCP to make a destroyed-city diorama that could actually be printed. An earlier image-driven scene had been too complicated for the intended process, so the author narrowed the design to a small base, rubble and part of a ruined building.
The author asked for visible corrections one or two at a time, including the wall shape, openings and rubble arrangement. Interior floors and walls were omitted to reduce troublesome overhangs. Codex generated and revised the model through Blender rather than only describing how it should look.
Exporting the STL revealed non-manifold geometry. Slicer repair filled windows, while Blender's repair tools changed the shape. The author therefore asked Codex to fix the mesh while preserving the intended geometry, then checked the export again in the actual slicer. The agent's claim that the problematic edges were gone was followed by that independent check.
The corrected scene was printed in PLA on an ELEGOO Centauri Carbon using tree supports and partly painted. Some lights were oversized because consistent dimensions had not been supplied, and thin details suffered in printing. The useful outcome is a real printed artifact and a specific mesh-repair loop, with physical detail and scale still judged by the maker.
Prompt
Original prompt
Source: note · tukimi-sato
Frequently asked questions
Why did ordinary mesh repair fail?
It filled windows or altered the intended geometry.
What verified the agent's mesh fix?
The author reopened the exported STL in the actual slicer before printing.
What limitations remained?
Some lights were oversized and thin details were lost in the physical print.
More details
About this account
The author reduced the diorama scope and gave Codex successive visible geometry corrections. Codex revised the Blender model and repaired non-manifold edges without filling the intended openings.
Japanese original and author's English version opened. Original prompt excerpt is Japanese. Slicer checks preceded printing; oversized lights and lost fine detail remained visible in the physical result. Original prompt excerpt.
Credit: tukimi-sato — note
Source published 9 Sept 2026
Source checked 14 Oct 2026
Tools and topics
Codex · Blender MCP · 3D Print Toolbox · ELEGOO Centauri Carbon
3D printing · Mesh repair
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.