Need respirator recommendations

My respirator is a 3M brand. I'm just a hobby painter, so the price of the full face, supplied air masks are too pricey for me. What I do, is take a coffee filter and cover each filter cartridge with one, and hold it in place with a rubber band. I change them between every coat while I'm waiting for it to flash off. It keeps the filter cartridge's clean and free of paint overspray, and I never smell a thing. I just do epoxy primer, 2K and high build primer, and use base/clear. Every now and then I'll use straight single stage urethane enamel on something. Honestly, my heavy duty Covid mask that I wear in the grocery store or Wal Mart is harder to breath thru than adding the coffee filters to my 3M paint mask! :realcrazy: