Fishing bobber (float)

thingiverse

You'll need a 13.6-gram fishing bobber, also known as a float. The top and bottom can be screwed together, but you have options for how to do it. You could use a float stick or a line holder on both ends - the choice is yours. To make sure your bobber doesn't leak, apply glue to seal the screws after tightening them. This will keep water out and ensure everything stays in place. As for colours, let your imagination run wild!