Tray 1: A4: 75 to 90 g/m² HP envelopes: 75 to 90 g/m² HP Photo Paper: up to 250 g/m² HP 10 x 15 cm photo paper: up to 250 g/m² Media Weights Supported, By Paper Path (metric) Media Weights Supported, By Paper Path (Imperial) Paper (plain, inkjet, photo), envelopes, transparencies, labels, cards, the HP premium media, iron-on transfers, borderless media I did find the paper size information in another source. HP ENVY 5660 e-All-in-One Printer (F8B04A) Specifications

The specifications do not include information on Custom Paper Sizes for paper sizes the document does mention custom paper sizes when using the ADF I am not sure this will work on your printer - I can provide some places to check / adjust the various settings. Only have about 8 envelope size options and none will print properly. I am trying to print address on A7 size envelopes and none of the options on printer match. Chinese to the HP Community HP ENVY 5660 e-All-in-One Printer series.Business PCs, Workstations and Point of Sale Systems.Printer Wireless, Networking & Internet.

DesignJet, Large Format Printers & Digital Press.Printing Errors or Lights & Stuck Print Jobs.Notebook Hardware and Upgrade Questions.