Cardboard Box Generator
Any-size box templates as SVG/DXF with score lines and sheet splitting.
Cardboard box generator for laser cutters (probably should work with the Cricut as well).
A free browser tool from Cutting Paths: enter box dimensions and measured cardboard thickness, pick regular / tuck-top / flat two-piece, and it exports ready-to-cut SVG or DXF. Handles boxes bigger than your material by splitting across sheets, exports dashed score lines (red) or blue score layers for light passes, corner tabs, lid clearance that scales with thickness, and green sheet outlines for alignment. SVG/DXF output means a Cricut workflow should be workable, though score-line settings differ per machine.