Foam board insert guides
Most inserts that don't fit fail on the measurements, not the cutting. These guides cover the numbers that matter. Each one cites its sources and links back to the designer.
Measuring a box interiorWidth, length and usable depth, and where boxes lie to you.
Space for cards and sleevesSleeve sizes, stack thickness and slack.
Removable traysClearance, lids, finger room and stacking.
Foam board thickness3 mm, 5 mm, 3/16 in, and how to measure yours.
Common measuring mistakesThe errors that make inserts too tight or too tall.