Marching Circles Makes Custom 3D-Printed Trays

Field notes

The page builds trays from per-unit specifications rather than asking users to edit a general-purpose model. Unit rows can be reordered, removed, and assigned circle or square cutouts, while tray settings control border height, base height, spacing, and looseness. Magnet pockets can be added both around individual units and beneath the tray, and the interface includes a 10 mm calibration cube alongside the STL download control.