Samsung CLP 680ND Printer, is now serviced by HP.
[1]
Older drivers for older macOS, for this printer, are here:
https://support.hp.com/us-en/drivers/selfservice/samsung-clp-680-color-laser-printer-series/16462332/model/16462336
( Basic-Drivers for macOS 10.13 , 68MB ).
[2]
But it may be software/driver compatible with Samsung CLX-6260 series drivers,
( in old samsung forum, i have seen users having conversation that atleast some components were similar ).
Printer (6260) page on HP site is here:
https://support.hp.com/us-en/drivers/selfservice/samsung-clx-6260-color-laser-multifunction-printer-series/16462350
& then change the page's OS selection into macOS 12 Monterey.
Then go inside "Drivers" section, you should see a DMG file for "Samsung CLX-6260 Series Print and Scan Driver" ( V5.06.03 <-- this was the last version when i visited the site on Dec-29, 2022 ) , & here is a direct link to that version's DMG file ( file-size 20.1 MegaBytes ).
[3]
Here is a direct-link to DRIVER BUNDLE ( VERY BIG DMG FILE-SIZE : 584 MegaBytes , v5.1.1 , CREATED 2021 , POSTED ON 2022) , in apple site , for HP Printer (and for Other Brand Printers Which Are Now Serviced By HP) Drivers , For macOS 12 Monterey.
Original download webpage & more info is here.
[4]
Another option is: download the "HP Easy Admin (for macOS)" and search for the drivers you need.
Pls let us know here, which you tried & if it worked or not, thanks in advance.