Adjustable Sun Dial

prusaprinters

<p>Because the discrepancy between the sun stand and our measured time, I created this adjustable sun dial with four rows. It won't be very precise but at least better than a static sun dial.</p><p>Each row represents three months. Adjust the tiles while the “middle month” (February, May, August and November).</p><p>End of October summer time changes to winter time. So when the tiles are set in November, the shown time for October would be one hour too late. That's why I made the marking +1 next to October to remember that one hour plus must be counted.</p><p>&nbsp;</p><p><strong>Printmaterial / Assembling</strong></p><p>For the body and the Gnomon I recommend to use material with higher temperatur resistance than usual PLA, to prevent bending because the longtime exposure to the sun. I used BioTec material which is printed like PLA but can be hardened by putting in the oven at 80°C for 4 hours. Temperatur resistance after this process is around 110°C. I think this should be sufficient.</p><p>The Gnomon you can just push into the grooves, it's thight enough, so no glueing necessary.</p><p>Also the tiles you can just push over the rail. I used PLA for the tiles and it works so far… I had one PLA which broke immediately when pushing over the rail. So maybe it's better to print the tiles in PETG.</p><p>I prepared print files for both PLA and PETG.</p><p>&nbsp;</p><p>Cheers!</p><p>&nbsp;</p><p>27.6.2021-<strong>Updated Gnomon V2</strong></p><p>I changed the angle to 40° degrees and centered it to have a more appropiate shape of shadow on the rows. Especially for the early and late hours.</p>