Nest on the scrap.
The offcut drawer, mapped: photograph the bed, mark the corners, cut from the leftovers.
The problem it solves
Half-used plywood and acrylic sheets live as a drawer of unlabelled offcuts. The app's answer: photograph the scrap in the machine, mark it up on a picture that maps to the real bed, and nest the next job straight onto the leftovers.
A bank card is the ruler
A bank or ID card is 85.60 × 53.98 mm — ISO/IEC 7810 ID-1 — anywhere in the world. Put the card in the photo and the true scale comes free, the same card-check the app's true-size screen uses.
Four corners → the bed map
Mark the bed's four corners in the photo and a normalised direct linear transform builds the photo-to-bed map (the app's tests check a tilted synthetic photo comes back within 0.2 mm). Marks get refused when they're crossed, near edge-on, too close together or ill-conditioned — the map has to stay honest before it's allowed to exist.
The nesting itself
| rule | value |
|---|---|
| the photo's resolution | 5 px/mm, capped at 2,400 px on the long side (a 300 mm bed is 1,500 px) |
| rotation snap | 15° |
| the laser's origin | front-left by default, selectable per laser |
The honesty card
The app states its own limits in plain words: "a photo can be off by a millimetre or two, more near the edges and with a card". The spec's target — 1 mm over 300 mm — is not yet measured on a real bed's photo. So: keep clearances generous on scrap work, and treat the 1 mm as the floor, not the promise.
Scrap work is the habit that pays twice — the nesting saves material, and the bed photo doubles as the record of what you already own.