https://phys.org/news/2019-01-d-printed-particle-free-cern-schematics.html

At the heart of its design is an electric quadrupole a special configuration of positively and negatively charged electrodes. The fields generated by these electrodes connected to an AC power supply limit the direction in which the particles can travel, effectively trapping them in the middle. Electrically charged particles dropped into the quadrupole ion trap oscillate along the electric field lines, allowing you to observe their orientation in three dimensions.

The S'Cool LAB facility offers high-school students and teachers the chance to take part in hands-on particle-physics experiments on-site at CERN. But they also have a variety of openly licensed tools that anyone with access to 3-D printers can make. These include cookie cutters to produce your very own quark-themed cookies, puzzles that challenge you to form particle systems according to the rules of the Standard Model and a scale model of the toroidal magnetic system of the LHC's ATLAS detector.

                                                            
                                    
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