Summary

Air gap capacitors are so very expensive, so I make my own. This is two end brackets, one set of spacers for anode and cathode, a stencil of anode and cathode plates, and an alignment tool. Most likely best printed in ABS, ASA, or PETG; PLA is just too low temp to last. Provide your own metal plates and connectors. I would suggest stainless steel or aluminum of 1mm thickness. This can be made as long or short as you want to fit your needs, tinker and resize as needed as well. Have fun, 73 de KI5LBY