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It controls the order in which files appear on your 3D printer's screen when you browse a USB stick, and it can copy one "master" stick to several others with the same files in the same order. It can also rename the stick.

Any printer that lists files in the order they're stored on a FAT32 stick, rather than sorting them alphabetically or by date. That's common on many printers, including Prusa machines. If your printer sorts files itself, the order on screen is decided by the printer and UsbDeck can't change it.

Yes — FAT32 (shown as MS-DOS (FAT32) in Disk Utility). That's what most printers require anyway. exFAT and APFS sticks aren't supported for ordering.

Yes. No subscription, no in-app purchases, no account.

On FAT32, the file list is stored in the order files were written — so whatever you copied first appears first, regardless of name or date. Copying a folder in Finder doesn't guarantee any particular order. UsbDeck rewrites the files on the stick in the sequence you choose, so the printer's list matches it.

• Eject the stick properly from your Mac before unplugging it, so all changes are written.
• Unplug and re-insert the stick at the printer, or restart the printer — some printers cache the file list.
• Check that the printer doesn't have its own sort setting (by name or date) switched on.

That's expected: a newly copied file is written last, so it's listed last. Open the stick in UsbDeck, move the file where you want it, and apply the order again.

Each folder has its own list. UsbDeck orders the files inside the folder you're working in, so if your printer shows folders, set the order for each folder you use.

1. Prepare the master stick with the files and order you want.
2. Plug in the sticks you want to copy to.
3. Choose the master, select the destination sticks, and start the copy.

Each destination ends up with the same files in the same order as the master.

They are removed so the destination matches the master exactly. UsbDeck shows you what will be removed before it does anything — back up anything you want to keep first. The master stick itself is never written to during cloning.

As many as your Mac can have plugged in. A powered USB hub helps with larger batches. Overall speed depends mostly on how fast the sticks are.

• Make sure the stick appears in Finder first. If it doesn't, try another port or cable.
• If macOS asks whether UsbDeck may access removable volumes, choose Allow. You can change this later in System Settings → Privacy & Security → Files and Folders.
• UsbDeck only works with external, removable drives. Your Mac's internal disks are intentionally hidden.

FAT32 names can be at most 11 characters, and some characters aren't allowed (such as * ? / \ : " < > |). Names are usually shown in capitals. Try a shorter name with only letters, numbers, spaces, or dashes.

Usually this means a stick was disconnected, is full, or is failing. Re-insert it and run the copy again for that stick. If the same stick keeps failing, reformat it as FAT32 in Disk Utility or replace it.

Please email support with your macOS version, UsbDeck version, printer model, and a short description. Screenshots help a lot.