| Paper path | Rear
paper feed slot, top entry
WF-3620: Paper cassette, front entry WF-3640: Paper cassette 1 and 2, front entry |
| Capacity | Rear paper feed slot: 0.01 inch
(0.3 mm) paper thickness
WF-3620: Paper cassette: 1.08 inches (27.5 mm) stack thickness WF-3640: Paper cassette 1 and 2: 1.08 inches (27.5 mm) stack thickness |