printing address labels

Go to the Card menu in Contacts and select Look for Duplicatres:

I believe it will let you merge duplicates into one contact.

WARNING: if you have cards of the same company but with different people or departments shown they will be merged into one contact card. You may not want that so be warned.

Otherwise you can create a new List in the sidebar and add just those you want to print to it. Then open the list, select all and print.

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and print from there to a PDF. Check the PDF to see if you got rid of the duplicates. If so reboot normally and do a test PDF print again before regular printing.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

Please read the following user tip and restate your question/problem in detail: 

     Writing an Effective Apple Support Communities Question - Apple Community

Are you indicating that your have duplicate contacts?

What problem are you having printing exactly? Can you provide a screenshot?

zzzahtram Said:

"printing address labels: About half of the contacts are doubled up, have double checked the addresses. Any ideas? Running macOS Monterey 12.6.1"

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Troubleshooting Duplicate Contacts:

A. Contact Apple Support:

1. Go Here: If you See Duplicate Contacts after Setting Up iCloud Contacts - Apple Support
2. As it Reads: If you see duplicates in Contacts on iCloud.com, visit Apple Support for help.

Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

B. Avoid Using Third-Party Apps for this:

Important: Avoid using Third-Party Apps as they may damage your photo library. Find More on this Here: Using Third-Party Apps to Remove Duplicate Photos Might Damage your Photos for macOS Library - Apple Support