Super Heavy Metal Spinner

thingiverse

For this spinner, you need to cast metal in a sand mold. Please note that using lead is problematic, as it is toxic (especially the fumes when melting it). Maybe tin would make a better choice. The reusable form is supplied with a small handle, it is prepared to make an open mold. Afterward, some sanding will equalize the difference in weight, so it runs smoothly. The supplied cap is quite concave; it has to be printed upside down with some support material. But you can, of course, use any other cap for the 608 ball bearing. I achieved 5 minutes and 13 second spinning time (speed up by hand, no compressed air or such).