Circuitmess Wacky Robot Bob Instructions Manual page 16

BOB BUILD GUIDE
To get two smaller casings from the kit,
you'll need to break one large acrylic piece.
But please, be super careful when
doing this to make sure you don't
damage the parts you need.
After breaking it, you'll end up with two separate pieces of
acrylic casings. If you find there's too much excess acrylic
in the holes of the casings, just gently push it out.