*Note- I don't think a printed pin is going to be satisfactory. Going to redesign to use a machine screw and captive nut, or maybe a machine screw with a machine screw post. Trying to find the appropriate dimensions, but may have to go to the hardware store and get the measurements myself.
I haven't printed this yet, so I don't know how well it will work. But the idea is that you use these as adjustable blocks when clamping material down. Please see the picture I attached.
Note: The actual picture is not mine. I found it via an image search.
The idea is from http://tomstechniques.com/tutorials/stack-blocks/
Print 1 Top Block, 1 Bottom Block, 10 Middle Blocks and 1 Pin Shaft. The pin shaft is designed to fit this quantity, per the design drawing.