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 a 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!
This video shows you how easy it is to assemble:
https://youtu.be/OG50VaT9Jg0
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
For the clock, I used this Real Time Module: https://geni.us/rtKYLJT
This is the board I use to connect the servos: https://www.sunfounder.com/products/servo-control-board
Recommended print settings:
Layer Height: 0.2mm
Nozzle: 0.4mm
Infill: 15-18%
Total Material: ~190g
Can print on any sized 3D printer.
**All the files have been pre-oriented to save you some set up time! All you need to do is drop the parts into your slicer and hit print!
Rev 1 Change Log:
Changed "Detent.STL" and "Top Plate.STL"
Fixed issue where the C-Clamps on the Detent get in the way of the Top Plate sitting flush on the Back Plate by moving the detent pins in a touch.
Rev 2 Change Log: Added a folder that has cams with a slightly larger clearance if you're having trouble sliding the default clearance cams down the cam shaft.
Rev 3 Change Log:
Added Base Piece and two different connectors to connect the modules together (so you can build counters or clocks). Also added some sample code to the file package for arduino.
Rev 4 Change Log:
Reinforced the flanges that hold the racks (on the top plate) to address the issue where they were breaking off during assembly
