This is a case for the Apple Pencil accessories.
It can store the Lightning adaptor, the cap of the Pencil and up to four tips.
The two parts hold together with four 5 x 5 mm cylindrical magnets, mine are actually just 4.95 x 4.75 mm, so the holes for them are only 4.9mm deep.
I added a version for the second generation of the pencil for which you don't have to store a cap and lightning adaptor so just for some addtional tips. Didn't print this as I don't own a new iPad with a new pencil (yet) but it is just the orignial first generation model shrunk so it should just print as fine as the other one.
0.1mm layers, 0.4mm nozzle
Printed in Colorfabb nGen white