What are the maximum custom paper sizes I can load?
For the WF-7520, you can load custom-sized paper only in tray 1. Load only 1 sheet of custom-sized paper. Standard custom sizes supported include 3.5 × 5 inches, 11 × 14 inches, #10 Envelope, A6, or Half-letter sizes.
From the official Epson WorkForce Pro WF-7510 All-in-One Printer manual, page 49
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