Samsung SL-M2020W QuickStart on Mac OS X 10.x
The Mac Tutorial Shows You How-to Download and Install the Samsung Black and White Laser SL-M2020W Xpress Printer Driver for Mac OS X 10.6-Snow-Leopard/10.7-Lion/10.8-Mountain-Lion/10.9-Mavericks/10.10-Yosemite/10.11-El-Capitan/10.12-Sierra Unix/BSD.
In case the Samsung Printer Drivers for Your Mac OS X Version are not available then you can still Use the Existing Ones for mac os x 10.6+…

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Download Samsung SL-M2020W Printer Driver for Mac OS X
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Select Open with Archive Manager or Double-Click on .zip Package to Extract
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Double-Click on Install Software inside the PrinterDriver Folder
Solve App from Unidentified Developer for Mac OS X 10.9+:
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After Follow along the Samsung Drivers Installation Wizard
Accept the License
You choose How the printer will be Connected to the computer
The Printer Must be Recognized from the Installer!
Continue until the end of Installation… -
How-to Wireless Connect Samsung Printer to Mac OS X 10.12: