I regularly lost my table tennis ball behind different pieces of furniture and needed a good tool to retrieve it.

This little picker mounts on a stick (eg. bamboo or plastic) with a diameter of appr. 8 mm. With a thinner stick, just put some glue in the hole. Maybe hot glue?

To pick up the ball just press the tool down over the ball and smile!

I printed it in PETG - I guess PLA, ABS etc works just as fine. Just print it lying down flat with support under the “mounting cylinder”.