  Nobel laureate Wolfgang Paul showed, back in the 1950s, that charged
particles can be trapped using alternating electric fields. This technique is
commonly referred to as Paul traps or radiofrequency traps (RF-traps) and is
used in various areas of modern physics. This paper presents a 3D-printed
mechanical Paul trap, a na\"ive simulation of the system in Python, and student
investigations. The files for the 3D-printed trap are available for download
and print, and the code for the simulation is available to run and tinker with.
