USB Cord for Printer: USB-B From Both Ends
The square plug that never fits anything else is USB-B, and printers have used it for two decades.
Quick Answer
| Variant | Plug | Data | Found on |
|---|---|---|---|
| USB-B 2.0 | Square, bevelled | 480 Mbps | Most printers and scanners |
| USB-B 3.0 | Wider, taller section | 5 Gbps | Faster printers and drives |
| USB-B mini | Smaller | 480 Mbps | Older devices |
| Charge only cable | Same shape | None | Cheap replacements |
Printers rarely need 3.0 speed, so a 2.0 cable is usually correct regardless of what the printer supports.
Choosing a Replacement
Match the socket
A wide 3.0 socket takes the wider plug. A standard socket takes 2.0 only.
Check data capability
Charge only cables look identical and transfer nothing. Test if the printer does not appear.
Check the host end
Usually USB-A. Modern machines with only USB-C need a C to B cable or an adapter.
Length
Standard lengths of one to three metres suit most desks.
Why the Printer Does Not Appear
- Cable is charge only. Test with another cable.
- Socket mismatch, forcing the wrong plug.
- Port issue. Try another USB port.
- Printer not powered on or in error state.
- Driver missing on the computer.
Real-World Applications
- Home and office printers.
- Scanners and all in one machines.
- Label printers in workshops.
- Older external drives.
Related Guides
For Mini-B devices, read USB Micro B. For network printing, see network cable for printer. For hubs, start with USB 3.0 hub.
FAQ
What is the square plug called?
USB-B, in 2.0 and 3.0 variants.
Do I need USB 3.0 for my printer?
Rarely. Printers rarely exceed 2.0 speeds in practice.
Why is the cable loose?
The plug may be the wrong variant, or the socket is worn.
Can I use a longer cable?
Yes, within the USB limit of about five metres for 2.0.