It’s on my 3d printer as well.
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to be fair, your 3d printer also has "printer" right there in the name
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*facepalm* of course!
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It was designed with two different cable ends so you would never connect one host to another. It’s a cable keying strategy and it prevented this before micro or mini became avail. They are also more mechanically stable than other options.
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This is the correct answer. A and B were in the original 1995 spec. A for hosts. B for devices. The keying was also meant so you would not connect two power supplies. Unrelated: in the spec the usb logo is always supposed to be facing the customer on insertion.
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As for why printers ONLY - they’re like the horseshoe crab of early peripherals. Most things evolved for portability (like external hard drives switching to mini/micro) or were superseded (like scanners replaced by smartphones). Every other large computer peripheral died off.
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Okay so the weird thing is USB B is also standard for synthesizers? Maybe it's just the standard for Larger Objects That Might Get Jostled. It does grip better than micro.
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I think usb audio equipment generally (some of which is smaller)? My audio interface and usb mic both take usb-b, as well as my two synths.
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It was a conscious decision to use usb-b on larger devices with detachable cables to make sure people don't connect a host devices to one another.
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A guess: USB-B used to be everywhere, but when the rest of the industry moved on, printers stayed put, as USB-B usurped parallel as what is considered a “printer cable.”
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yeah it's gotta be about the moment in time printers got USB, & lack of a reason to change it (no mobile size constraints)
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Just bare in mind that mice, etc all had the cable attached at the other end. So keying wasn’t an issue. A Midi controller or a printer didn’t. So keying is an issue to prevent hosts from connecting.
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I would assume power. If not for the printer itself, to be plug compatible with hard drives that did require more.
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* forgetting about the critically important Arduino Uno
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I think that was more of a "hey, we can replace the DB-9 serial with that!" decision. You used to be able to buy DB-9 form-factor USB-B ports, complete with thru-hole 9 pins and embedded FTDI chip
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I have scanners, hubs, an IEEE-488 interface, and an oscilloscope with USB B connectors.
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I've got a RAID enclosure, a USB hub and a display with USB hub with USB3-B, and have at various times had scanners, external HDDs, printers, hubs, a plotter, an Arduino, and probably a few other devices with USB2-B. So anything that's large enough to easily accommodate it?
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Printers and JTAG debuggers
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The Stonecutters did it.
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