The Answer.

Also, just having fun trying out a some 3D CAD and printing ideas. More versions on the way.

This one : 42 Transparent Question

This one requires transparent PLA to work properly; the Answer is revealed when you hold it up to the light at the proper angle.

This was a good opportunity to experiment with transparent PLA - really should be called translucent in most cases.

OnShape 3D CAD files :

https://cad.onshape.com/documents/2295bdf4247cc4494b7d7432/w/1c05dab1d1343735fb74e8f1/e/2112fba17b8853356fa4a241

Print instructions

Print in PLA in two colors using filament switching with the provided 3mf file. The first filament should be transparent, followed by a color of your choice, and then switching back to transparent at the end.