The maze cylinder has an "entrance" and "exit" for the outer ring on the bottom and top respectively. The challenge is to feed the ring from bottom to top or to remove the ring from the middle of the maze cylinder as fast as possible. 

Easy? Well... sometimes it can take a couple of seconds and sometimes a couple of minutes or more, it all depends on the twists and turns you make on the way! The inner cylinder which carries the maze is approximately 65mm tall and 40mm in diameter.

Have races with your friends,  put it on your desk, take it with you to the pub - a great diversion and something which will intrigue everyone you show it to.

The design comes from wgardner who published it on Thingiverse on January 17th 2014. The maze in the photograph below has been printed using 'Mellow Yellow' PLA filament from Faberdashery.

Armed with an empty cereal box - or similar - and a few 3D printed parts, you can keep your child engaged for quite a while as you both construct a Cereal Box Townhouse!

The original design comes from Dadhoc on Thingiverse: and this set of parts consists of three windows (only two shown in the photograph below), one door, one door frame and all of the necessary brackets and stencils. Additional windows and doors can be printed as needed  so that you can go as large as you want.

Take a look at the gallery of photographs here to see what others have made from my kit of parts.