"The Earth in Time" Clock + Night Light

prusaprinters

<p>This 3d printed globe is geared to a clock motor to rotate once every 24 hours. &nbsp;The continents are cutout to reveal a day side and a night side. &nbsp;If you set this up in the right place, it should show the exact position of the earth in time. &nbsp;</p><p>It also serves as a night light. &nbsp;The green and black inner shells are designed to hold a battery powered night light with the switch accessible at the very top, and the light shines through holes in the night side to give a star-like effect. &nbsp;</p><h4>Printing tips</h4><p>The outer globe is a fairly challenging print. &nbsp;I printed it in two halves out of Ultramarine blue Prusament PETG. &nbsp;I'd suggest 150% XY separation for the supports to prevent interference, but these two parts will require some very careful work with some snips to remove the supports. &nbsp;The files are set up for Prusaslicer and should have the configuration available. &nbsp;<br><br>I'd suggest printing the timing gear with the same filament and configuration as the globe to ensure smooth operation. &nbsp;</p><p>The other parts should be a lot easier to print and material shouldn't matter too much. &nbsp;</p><p>I printed the globe and timing gear with a 0.4mm nozzle, and used 0.6mm for the rest of the components. &nbsp;</p><p>NOTE: the files on the system are updated from the photographed model for better printability and larger tolerances. &nbsp;Unfortunately I've been away from my printer for the last two weeks so didn't have time to get photos of the updated version. &nbsp;</p><p>If you have a lot of time to print this you may want to consider scaling the whole thing up by 120-150%. &nbsp;It will take a lot longer to print but the clearances will be larger and the finer details less delicate. &nbsp;Currently the globe is around 12cm in diameter.&nbsp;</p><h4>Assembly</h4><ol><li>Place the clock motor in the square recess in the base, and press-fit the timing gear onto the hour shaft.</li><li>Place the light into the recess on the night side with the light side facing towards the holes.</li><li>Place the lower half of the outer globe in place with the gears meshing. &nbsp;(You may want to add some butter or oil to the contact surface to ensure it runs smoothly)</li><li>Place the day side over the other side of the lamp to form the inner globe. &nbsp;(See section views for further information)</li><li>Place the inner globe into the base. &nbsp;The small circular stem from the base of this globe fits into the circular recess in the base.</li><li>Place the upper half of the globe over the inner globe, taking care not to damage any of the fine details. &nbsp;Use a dab of glue or tape to secure it to the bottom half.</li><li>Check to make sure that everything is rotating smoothly. &nbsp;The light switch should be accessible at the top.</li></ol><h4>Components used</h4><ol><li>Night light: <a href="https://www.amazon.co.uk/gp/product/B00EIIDA1Q/">https://www.amazon.co.uk/gp/product/B00EIIDA1Q/</a></li><li>Clock motor: <a href="https://www.amazon.co.uk/gp/product/B078RK47HL/">https://www.amazon.co.uk/gp/product/B078RK47HL/</a></li></ol>