Is it digital, or is it analog?  Well it's some combination of the two! The rack driven 7 segment display is a fully 3D printed mechanical desk piece that is equal parts satisfying and bewildering.  Turn the top dial to rotate a series of 14 cams which push on a rack and pinion system to reveal a number.  Operate is manually, or add an optional servo motor to the back and have the thing run on it's own.

You could even throw 4 of them side by side to create a clock!  Add another two and get the seconds.  Give one a randomized number generator and it becomes a dice!  Endless possibilities!

The STL File:

Prints on all standard 3d printers, requires no additional tools or assembly, and assembles in seconds.
For servo attachment (not necessary), it used these servos: https://geni.us/G8ArjNg

Recommended print settings:
Layer Height: 0.2mm
Nozzle: 0.4mm
Infill: 15-18% 
Total Material: ~190g

Can print on any sized 3D printer.

Rack Driven 7 Segment Display

Build 2 - Cams and Housing - 125g.stl

Rack Side (x4).stl

Top Plate.stl

Detent.STL

Cam (Larger Clearance)_Bottom Inverse.STL

Cam (Larger Clearance)_Bottom Left Inverse.STL

Cam (Larger Clearance)_Bottom Left.STL

Cam (Larger Clearance)_Bottom Right Inverse.STL

Cam (Larger Clearance)_Bottom Right.STL

Cam (Larger Clearance)_Bottom.STL

Cam (Larger Clearance)_Middle Inverse.STL

Cam (Larger Clearance)_Middle.STL

Cam (Larger Clearance)_Top Inverse.STL

Cam (Larger Clearance)_Top Left Inverse.STL

Cam (Larger Clearance)_Top Left.STL

Cam (Larger Clearance)_Top Right Inverse.STL

Cam (Larger Clearance)_Top Right.STL

Cam (Larger Clearance)_Top.STL

8mm C-Clamps (x6).stl

Central Clock Connector.stl

Dot Centres.stl

Dot Outlines.stl

Base Piece (For 2 Side by Side Modules).STL

Central Counter Connectors (to connect base pieces together).stl

seven segment display

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Rack Driven 7 Segment Display