Concentric Rings Fidget (with or without center dome or keychain loop)

prusaprinters

<p>I have printed successfully with a standard 0.4mm nozzle at 0.12 layer height, no support, and 100% infill successfully without needing any post processing off the bedplate but your printer calibration may vary. &nbsp;I was also able to print this successfully at 85% uniformly scaled down with no post processing as well. &nbsp;Both scales just worked off the bedplate. &nbsp;I recommend printing at 100% scale as I think it is more fun to fidget with.&nbsp;</p><p>The 100% scale print takes about 2 hours for me at 80mm/s print speed. &nbsp;I designed the model to compensate for any elephant's foot first layer squish to avoid fusing the first layer.</p><p>I settled on generating these stls with a 0.45mm tolerance between rings so that the rings spin loosely and freely. &nbsp;I made it loose enough that I think most printers should be successful when printed with a fine layer height (0.12mm). &nbsp;At 85% scale, the tolerance shrinks to 0.36mm.</p><p>If enough people like this design, I'll finish up my fully customizable source code and post that as well.</p><p>For reference, my kid prefers the fidget version without the keychain loop and without the raised center dome and printed at 100% scale.</p><p>Enjoy!</p>