Damn, 40x40 is massive! I was printing some 11x14 FB today and forgot just how large that was. My goal one day is to print 16x20, which was obviously the reason for starting this thread. But space is an issue and all mistakes are just magnified more and ultimately cost more $$$ each time you mess up. I'm still not sure. I admire printers that print large.
You admire their wallets, you mean?
Yeah, every mistake costs 5$ + 1 hour of your time. It adds up quickly.