Quadrupole ion traps can be used to trap electrically charged particles. At CERN, the GBAR experiment at the antimatter factory uses this particle trap to store anti-hydrogen-ions. Below you can find building instruction for 3D-printable quadrupole ion trap capable of trapping electrically charged "macroscopic particles" such as cinnamon of lycopodium spores. The quadrupole ion trap operates using a 3 kV 50Hz alternating current power supply and uses an astable multivibrator circuit to illuminate the spores, using the stroboscopic effect to exhibit their movement. In addition, we provide worksheets to help students discover the physics behind these traps.
Read a short paper about the design of the trap here. All files can be found on Zenodo (DOI 10.5281/zenodo.1251786): DIY Manual and Student Worksheets, STL files for 3D printing & Modifiable Design Files F3D Fusion 360 files