Anybody know where I can obtain a FREE copy of the printer driver I require for my 2017 MacBook Air?
Excuse me for posting what would seem to be obvious, but did you try a Google search on anything like:
'Mac Driver for SAMSUNG SCX-4200 laser printer'
which seems to produce lots of possible options for downloading what you are looking for.
Have a look here:
Yes, I'll probably get heck for suggesting doing a Google search, but I find they work very well and I believe these forums are designed to provide help for Mac users and their Mac and associated device problems.