This is a table leveler that can be used on any table with round legs taht are smaller than 2.0" in diameter. It requires no tools, such as a drill and drill bit, like other commercial equivalents. 

YouTube link for a verbal and visual description of this part: https://www.youtube.com/watch?v=TeUMRk6ARBg&feature=youtu.be

For a 4 legged table, it would cost approximately $1.06 to print enough parts (assuming 2 discs per leg). This is a much cheaper option than commerically available screw table levelers, they are typically around $10.00 a piece for a non-marring version. It is also important to note that almost all commercially available options require the user to have a power drill and drill bit to install them (sometimes even a tap).