A sundial you can wear on your wrist. Includes a compass and a level to ensure proper orientation.
1h 7m
4× print file
0.20 mm
0.40 mm
8.00 g
In the contest Timekeepers
71
135
2
1371
updated June 9, 2023

Description

PDF

Prusa's timekeepers contest [https://www.prusaprinters.org/contest/11-timekeepers] and a little extra time off due to Memorial Day [https://en.wikipedia.org/wiki/Memorial_Day] presented an opportunity to revisit my sundial wristwatch.

Major changes that you can see include

  • Making the gnomon a permanent part of the face, rather than a piece that has to be stowed and deployed
  • Making the hour markers “valleys” instead of “hills”

Behind the scenes, I refactored the design to make it easier to change the design latitude. Now I just have to change a parameter in Fusion 360.

To start, I'm including

  • 32⁰ (Jerusalem)
  • 39⁰ (Washington DC)
  • 50⁰ (Prague)

Shopping List

  • The compass insert I used is https://www.amazon.com/gp/product/B0052CEFMU
  • The bubble level I used is https://www.amazon.com/gp/product/B07M9RFT97/
  • The watchband I used is https://www.amazon.com/gp/product/B01APUQHR4/

Assembly

On my printer, the compass and bubble levels were press fits, but I found that if I bumped my wrist they sometimes fell out, so I used a drop of super-glue to hold them in place.

If you find you the inserts don't fit, it should be a simple matter to adjust the scale in your slicer.

UPDATE 01 JUN 2021

If you are one of the five people that has already downloaded this design, I apologize to you. I double-checked my calculations this morning, and found that I used the tangent of latitude (instead of the sine) when placing the hour markings on the dial. I have uploaded corrected files.

UPDATE 02 JUN 2021

A little more tweaking of the mounting hole for the compass to give it a tighter fit. If you're happy with what you've already printed, no need to download again. If you're frustrated that the compass is a little loose, the new files may help.

I promise (B"N) that I'm really done this time. Of course, if you had asked me yesterday, I would have said the same thing…

Tags



Model origin

The author remixed this model.

License