Fix the blood analog, port edge clearance, Explode on slide chips, and saved check thresholds

[Jujified]

What this changes

This fixes four issues found while re-checking the documentation against the code.

• Blood analog preset. It now uses 33.5 % glycerol by volume, which gives the ~3.5 mPa·s its note promises. At 40 % the app's own viscosity model gave ~4.8 mPa·s. The test now holds it to 3.3–3.7 mPa·s instead of 2–6.
• Port edge clearance. channel-near-boundary now measures a port by the boss or pedestal it prints, not just its opening. A luer slip's boss is 5.9 mm across, not 4.27 mm, and the boss reaches the chip edge first. The 0.8 mm boss wall is now one constant (PORT_BOSS_WALL_MM) shared with the CAD builder, so the check and the geometry can't drift apart. A luer lock is unchanged, because its thread is already its outermost part.
• Explode on glass-slide chips. The button now works and lifts the glass off the plate. The viewport already supported this, but the toolbar disabled the button and its tooltip called the chip monolithic.
• Design-check thresholds are saved. Minimum printable wall, overhang limit and taper ratio now persist in the browser between sessions, like the app settings, so a wall value measured off a test print doesn't need retyping. They aren't written into the project file. On load, stored values are validated against the defaults.

How it was checked

• npm run build && npm test && npm run lint pass. That's 405 tests, 6 of them new:
  • edge clearance with and without a boss;
  • portOuterFootprintMm;
  • restoring stored thresholds, including bad values.
• None of the seven templates gains or loses an edge warning: I ran the check across all of them before and after the change.
• The blood analog figure comes from the app's own Cheng (2008) model at 20 °C: 33.5 % by volume gives 3.52 mPa·s.

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Project	Deployment	Actions	Updated
open-chip	Ready	Preview	Oct 19, 2026 12:56am UTC