Wall Sleeve for air conditioner/mini-split line to outside.  3" (76mm) or 2.5" (63mm) opening with small downward angle to allow drainage pipe to operate correctly.  Truncated lower inside flange to hide behind unit.  Print in PETG so it doesn't melt in the sun (?).

Length can be adjusted for between 3.5" and 5.2" wall thicknesses.