Credit Card Cup Conserver

This is a project I did to stop my paper cup of coffee sliding off the tables in the lecture hall, which are slanted by 9 degrees. To use it, the 'hook' on the sliding part must be placed behind the front of the sloped table, so the feet rest on the table, downward from the hook. Assembly should be very straightforward. The sliding part was originally intended to adjust for the angle of the table, but it seems it has very little effect. Originally, I made a very bulky version, so I decided to slim it down to fit inside a wallet.