3D print a box base and lid, and then connect them together using commerically-available hinges. Default hinge measurements based on uxcell spring-loaded hinges (https://www.amazon.com/dp/B07GB66GPW)

Use OpenSCAD to modify box length, width, height of base, and height of lid.

• boxLength: minimum 24mm, maximum 240mm
• boxWidth: minimum 6mm (but would be silly!), no maximum
• baseHeight: minimum 10mm, no maximum
• lidHeight: minimum 10mm, no maximum
• wallThick: minimum 1mm
• backWallThick (thickness of back wall, which holds springs): minimum 4mm