Mechanical Expanding Pulley Box

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This is a new variation of the last year released mechanical dice set box. What’s special about it, is that it has a two stage opening mechanism, operated by a single turning knob. By rotating the knob, the seven doors will rotate open before the 7 compartments appear in a linear motion. This is thanks to an expanding pulley mechanism.

The box is 100% 3D-printed, the only thing helpful for assembly is some kind of lubricant to achieve a very smooth operating mechanism. The whole assembly is held together by a printed screw and doesn’t have any pressfitted parts, which makes it easier to print, since the tolerances do not matter that much (a clean print will still be needed for best functionality).
It is overall a fun project to build if you are interested in mechanical motion principles.

To see a detailed assembly video, click the link below:
https://youtu.be/HQ4r7loxCd0

Size of the assembled box:
130x130x80mm

Minimum printbed size:
150x150mm

Update 2024.02.18:
Added different door-designs:
- Door_Blank
- Door_Diamond
- Door_DiceSymbols

• Print orientation is already correct and should not be changed
• Recommended layer height up to 0.25mm
• 3 perimeters
• No supports
• 10-20% infill
• 0.4mm nozzle