12cm fan adapter (STEP editable file provided)

Model purpose: to exhaust the printer and dissipate heat for the cabinet
Applicable fan: length, width: 12cm height: 23.5cm-35cm
Inlet/outlet outer diameter 78mm, suitable for 80mm telescopic tube (PVC tube/aluminum foil tube)
Except for the chassis fan, no third-party accessories are required.
Provide STEP editable files