How Codex CLI helped me ship 3 releases in 48 hours — and what it got wrong

I maintain three open-source 3D printing tools: SupportSage (AI-optimized support structures), Printsight (photo-based quality inspection), and FilamentDB (filament parameter database).

Over two days, Codex CLI (gpt-5.5) helped me fix 15 bugs, add 86 new tests, and ship a unified CLI — across all three projects. Here's what worked, what broke, and what I'd do differently.

The three projects

The three tools form a closed loop:

FilamentDB ──→ SupportSage ──→ 3D Print ──→ Printsight