Continuing with the modular spirtit of the Snap On Portal Bookstand let's screw books (or whatever) together with this snap on bookstand.
The snap is compatible with the Snap On Portal Bookstand.
Adjust the nut to the proper "pressure" and have fun.
Print the stands (2x) and the head, tail and screw nut (1x) and snap the head and tail each to one stand. Screw the nut in and you're done :-)
To have a smooth screwing, spin the nut in the tail a few times before assembly.