FitCoupon 3D Print

About

Turn a printed tolerance coupon into evidence you can use in CAD. FitCoupon records nominal and caliper-measured dimensions for holes, pins, slots, and walls. It calculates signed error, suggested CAD correction, median geometry bias, and RMS variation without collapsing fundamentally different features into one magic offset. Plan a hole-and-pin pair from separate measured biases while preserving target clearance. Keep the result tied to a specific printer, material, nozzle, layer height, slicer, orientation, and measurement method. Export a designed PDF tolerance proof or CSV ledger. Compensation is profile evidence, not a universal printer constant. Print a fresh coupon whenever the setup changes. No account, subscription, in-app purchase, ads, analytics, tracking, cloud sync, or developer-server upload.