Won't print on card stock

[largin]

I have printed on card stock with my HP 8720 for all 3 years I have had it.  All of a sudden, it won't print on card stock.  It just prints a couple of smudges and spits the paper out.  

Any suggestions?  

Thank you

[Dragon-Fur]

@largin 

The printer might need a good cleaning.

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HP OfficeJet Pro 8700 Printers - Paper Jam Error

Comments...

Three years seems young for this model - I've not even had my 8740 for three years and it was no longer available for sale back then.  So... Three years is not "old" .  Depending on the level of use, the printer might be showing signs of "wear".

Try the cleaning and the Reset / Restart (in the document).

Check your card paper again - load / reload the paper, etc.

Even try some different paper, though if your paper is stored correctly, it is probably OK.

Make sure the printer is aware of the Paper Size / Type in the printer.

Example - Retain / Modify / Check Paper Size & Type - Tray and Paper Management

Retain_Printing_Preferences_10

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HP OfficeJet Pro 8720 All-in-One Printer series 

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[largin]

Thanks, I will try your suggestions.  Side note,  I bought this printer new from Best Buy in Jan. 2018.  

I can print on plain paper just fine but all of a sudden, the card stock won’t print.  I have been playing with it for a few weeks now but will try your suggestions and keep my fingers crossed that it wants to print properly again. 

thank you