Sundial Wristwatch v2.0

prusaprinters

<p>Prusa's timekeepers contest [<a href="https://www.prusaprinters.org/contest/11-timekeepers">https://www.prusaprinters.org/contest/11-timekeepers</a>] and a little extra time off due to Memorial Day [<a href="https://en.wikipedia.org/wiki/Memorial_Day">https://en.wikipedia.org/wiki/Memorial_Day</a>] presented an opportunity to revisit my sundial wristwatch.</p><p>Major changes that you can see include</p><ul><li>Making the gnomon a permanent part of the face, rather than a piece that has to be stowed and deployed</li><li>Making the hour markers “valleys” instead of “hills”</li></ul><p>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.</p><p>To start, I'm including</p><ul><li>32⁰ (Jerusalem)</li><li>39⁰ (Washington DC)</li><li>50⁰ (Prague)</li></ul><h3>Shopping List</h3><ul><li>The compass insert I used is https://www.amazon.com/gp/product/B0052CEFMU</li><li>The bubble level I used is https://www.amazon.com/gp/product/B07M9RFT97/</li><li>The watchband I used is https://www.amazon.com/gp/product/B01APUQHR4/</li></ul><h3>Assembly</h3><p>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.</p><p>If you find you the inserts don't fit, it should be a simple matter to adjust the scale in your slicer.</p><h3>UPDATE 01 JUN 2021</h3><p>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.</p><h3>UPDATE 02 JUN 2021</h3><p>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.</p><p>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…</p>