We recommend using a filter with a mesh opening size 75% or less of the 3D printer nozzle size
Screen 1/2" Dia 20 Mesh Support Screen (0.381mm Opening Size)
Screen 1/2" Dia 60 Mesh Coarse Filter Screen (0.229mm Opening Size)
Screen 1/2" Dia 80 Mesh Fine Filter Screen (0.178mm Opening Size)
PLEASE NOTE: This accessory is NOT for filtering highly contaminated plastic. This is to help filter small particles that were missed in the decontamination process. Anything added to the hopper MUST be clean of dust, dirt, paint, coatings, and tape, etc.