Open tray template
Set the dimensions. Check the folds. Make a small test box.
Flat panel guide
Assembly
- 1
Cut the continuous outside outline.
Flat panel guide
- 2
Score the four base folds and the corner-tab folds.
Flat panel guide
- 3
Pre-fold the walls upward and the corner tabs inward.
Folded assembly guide
- 4
Glue each tab to the adjoining wall while keeping the corner square.
Folded assembly guide
- 5
Let the joints settle, then check the base sits flat.
Folded assembly guide
Measure the base between folds
Length and width describe the flat base between crease lines. Wall height runs from the base crease to the outside cut edge. These are fold-line measurements, so the finished clear inside space can be smaller when thick card bends around the corners.
The example base is 220 × 140 mm with 40 mm walls. Its outer flat envelope is 300 × 220 mm before annotation space. Corner tabs fit within the recesses between neighbouring walls instead of adding another rectangle to that envelope.
Raise the walls in a controlled order
Cut the continuous outer outline, then score all four base creases and each tab crease. Fold the tabs inward and dry-fit the adjacent walls. Apply a thin layer of suitable glue to the hatched tabs, keeping glue out of the base and away from the exposed top rim.
Hold one corner square while the bond settles, then work around the tray. Check both diagonals before the final corner is fixed. A skewed base makes the last join difficult even when the printed geometry is correct.
Use it as an open organiser
This structure has no closing lid or tuck tongue. Choose it for visible storage, sorting or a display mockup, and avoid treating a paper tray as a load-rated container. If the large example spans two pages, align the printed registration marks before cutting the perimeter.