look in the PDFs for the link to a video that will show you the answer
this guy shows you how to make one with wood and how to solve don't cheat try and figure it out your self have fun:)
you will need to find a piece of string (I think a foot is good) and print 2 of the beads and blocks!
if you want to save your filament you can scale it down and it will still work!
Comment your time!
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.