This is my interpretation of a mini fig display stand allowing you to expand to as many as you wish. Each rail is very sturdy and you can stand or sit your minifigs on these rails.  While this my not be a perfect fit/design for all minis, it will hold them firm enough to display them with out them falling off once seated. 

NO glue necessary, rails slide  into supports.  rails will be very snug but if you slide it in and pull it out the next time you slide it in it should go in much easier, that or rotate rail and try it that again.  

To add more rails simply position the rails half way on the supports and add rails and 2 extra supports adding as many as you want.


I would love to see your print! post a pic.