These push button cartridges are compatible with the basic "Modular Candy Dispenser" found here: https://www.thingiverse.com/thing:4606016

These open cartridges allow you to see the spring mechanism in action and see what color candy is coming next.

If you want the candy to come out on the same side as the button, print the "self serve" files. If you want the candy to come out on the opposite side, print the "guest serve" files. You will need to print out both the "left" and "right" for each cartridge.

An "open button" is also included here so that you can see the candy passing through the spring and button mechanism.

See here for a video on how these and some of the other modules fit together:
https://youtu.be/759B56bt7HI

See here for more modules:
Enclosed Push Button Cartridges: https://www.thingiverse.com/thing:4606016
Enclosed Candy Reservoirs: https://www.thingiverse.com/thing:4606028
Voronoi Base and Reservoirs: https://www.thingiverse.com/thing:4606070