This is an alternate take on the record weight. Low mass, freespinning internal flywheel in an effort to use the self-stabilising gyroscopic effect.

Printed in PLA, uses a 22x8x7 open bearing, and ~150g of lead shot to fill in the flywheel cavities.

You need one piece of each model, and three pieces of the Weight Cap. Fill in with leadshot, glue the covers on. Press bearing, screw overall cap, enjoy.