[ntindle]

What this ships

One-click download of the test-fit pieces (F32 🟡 → ✅). With Test fit first on, Download files now includes the test pieces:

• stl/baseplate-1x1-x1.stl — the 1 × 1 baseplate, when the layout does not already have one (plus the edge spacer's STL when it is new)
• 3mf/plate-0-test-fit.3mf — a first 3MF plate holding just the test pieces, listed first in the README
• README gains a Test fit first: note naming the plate

Counts merge into the layout's STLs when the part already exists (a layout with a 1 × 1 baseplate gets baseplate-1x1-x2.stl, not a duplicate filename), and the main 3MF plates are unchanged — the test pieces are not double-counted across plates.

The switch state moved from PrintPlanCard's own hook into the shared settings (useGridfinitySettings, same gridfinity_testFit key, so existing users keep their setting) so the download follows it. The card takes testFit / onTestFitChange as props now.

Verification

Local gates on the branch worktree, all green:

• npm test: 541 passed, 11 skipped (49 files)
• npm run lint: clean (incl. no-comments rule)
• npx tsc --noEmit: clean
• npm run build: green, index chunk 227,799 → 228,122 B (+0.1%)

New tests: mergeTestFitParts (append vs count-bump, no-op), createPrintFiles with test fit on (zip contents, test-plate packing, merged counts, unchanged when off), card props + calculator-level persistence, and an end-to-end calculator test that the downloaded zip contains plate-0-test-fit.3mf and baseplate-1x1-x1.stl when the switch is on.

Perf (branch vs trunk, same box, node scripts/measure.mjs --n=15 --lh=3)

Metric	Branch	Trunk
Parity	45.0% (21 ✅ + 3 🟡 / 50)	44.0%
Lighthouse perf	71	74
TTI	3732 ms	3546 ms
Input-to-preview (median)	49.5 ms	41.4 ms
Layout task	4 steps, 565 ms	4 steps, 535 ms
Export task	supported	supported
Share task	1 click, 102 ms	1 click, 86 ms

No credible regression: a reversed-order re-run gave Lighthouse 69 vs 68, TTI 3885 vs 3951 ms, layout 551 vs 552 ms, share 85 vs 94 ms; an --n=30 --lh=1 pair gave input-to-preview 34.5 vs 33.2 ms, layout 481.5 vs 493.5 ms, share 81 vs 84 ms — the n=15 input-to-preview gap did not reproduce at n=30. The diff touches no measured code path (drawer-width edit → preview piece list is unchanged; the new work is one extra persisted settings key, a prop pass-through, and export code behind a lazy import() that only runs on download).

Notes

• The card's Copy list still shows the test pieces as separate lines when the layout already has a 1 × 1 baseplate (it merges by key; the test baseplate carries its own key). The zip README merges them into one count line because zip filenames cannot duplicate. The totals agree (11 parts in both).
• The tiny-bed (<42 mm usable) corner from the Test fit first switch in the Print plan card (F32) #150 review is unchanged: planPlates still throws during render for the test plate there, same as the pre-existing main-plates path. Follow-up guard, not this slice.
• Feature map refreshed 2026-10-26: andymai 4.523.1 (2026-10-25, 3MF multi-color fix) and 4.523.2 (2026-10-26, lid slider, design-linking quick export, split-bin seam gap) — all bin-designer/export-side, no planner-row impact; gridfinity-label-generator still 3.1.1; automaat still v0.6.0; no new tool.

Lane B

Awaiting Netlify deploy preview verification (core tasks + test-fit download) before merge.

[netlify]

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[github-actions]

PR Quality Report 📊

Check	Status
TypeScript	✅
ESLint	✅
Tests	✅
Build	✅

View detailed results

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@b40345e). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/utils/export/exportFiles.ts	96.15%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #154   +/-   ##
=======================================
  Coverage        ?   93.64%           
=======================================
  Files           ?       68           
  Lines           ?     3416           
  Branches        ?     1025           
=======================================
  Hits            ?     3199           
  Misses          ?      196           
  Partials        ?       21           

Flag	Coverage Δ
unittests	93.64% <97.29%> (?)

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