This is one of my first attempts at making a Design, they are always losing sockets at work and it takes them for ever and a day to get replacements so ever ones always asking to borrow mine so i decided to design a print where i could whip a few up for them on the quick 

Print straight up and recommend 40+ infill with a few extra walls for extra strength, i used standard PLA and for our use they seem fine 

haven't tried but im sure people in the know could scale to use for different size nuts