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7-Segments

3D model description

A mechanical 7 segment counter

A kit to build a mechanical display that cycles through the numbers 0-9 by turning a crank.
Do you love building mechanical contraptions? Complicated looking gear trains that perform some task?
Then this kit is for you !

However, beware. It is not for the faint-hearted. The assembly instructions are 26 pages long. The counter comprises of well over 100 parts.

If you want to take it even further you can install a motor and drive it automatically.

NB: The counter only counts in one direction, up. It cannot be wound backwards. If you'd like it to count down instead, grab the reverse gear set https://cults3d.com/en/3d-model/gadget/reverse-gear-set-for-7-segments

3D printing settings

I printed my units with a 0.2mm layer height on an Ender 3 with the standard 0.4mm nozzle in normal PLA. My printers are tuned for accuracy, well leveled to avoid elephant foot type artifacts and minimum stringing.

  • 3D model format: PDF and STL

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15 comments

Absolutely great design. Goal is 5 digits showing my current flight hours. I posted my make a couple of minutes ago. Some things were not 100% clear for me in the manual, in my make I added a few hints that might be useful for others.

Really great design! Is it possible to use it as a clock? Maybe 4 motors connected to one esp and control all of them. But what about hour and minutes separator? Would you think to design it?

@GRIMALDI you won't be able to fit the case on a 150x150mm build plate. Everything else should be fine.

Can I print this on printer with a 15cm x 15cm x 20 cm build volume?

@martincollar Thanks for your notes. I have updated the manual with the fixes. (Also, great print!)

Thanks man for awesome model. I’ve just posted my make. Btw there are few issues in the manual including issues with part list... you can contact me if you’re interested in fixing them I have it noted in the printed manual.

Is the PCB for motor control part of this package?

Commercial versions of this display are still in use for Sport Timing and you can still buy them new. Look at Alge Timing.

They use magnetics to switch the elements. Very very low energy to drive the display.

@UhansQkSqj 1.2*13mm would be better

Would 1.2*13mm or 1.2*15mm be better to purchase?

Could use a little help sourcing the nails. The closest I can get is 16ga 3/4in or 18ga .5in. I think shorter is better but the difference is nearly .2mm in the diameter. Cutting is my only option.


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