What would you like to troubleshoot?

[SonilGomes]

The first issue is that using a custom paper size (12x18 stored in the printer's "Custom size" parameter) in Tray 1 prevents the printer from using Tray 1 in cassette mode, i.e. to treat it like any other tray. If I load 11x17 into Tray 1, and set the paper size to "11x17", it will pull from there if I send it an 11x17 page and tell it to Automatically Select the paper source. However, if I set the size to "Custom" on the printer, then set the Custom size to 11x17, the printer will ask me to load 11x17 into Tray 3, which is where I normally keep it. This shows me there is an issue using custom paper sizes with cassette mode for Tray 1.

[sandytechy20]

@SonilGomes

Welcome to HP support community.

Provide the printer model number or the product number?

Which operating system is installed on the computer to which this printer is connected?

Reply with the requested information for more assistance.

Cheers.