StandOffs
thingiverse
https://www.youtube.com/watch?time_continue=116&v=Pe-ifs1rzDQ Video of designing it It took a couple mins to design works on my print you may have to adjust tolerances.
Download Model from thingiverse
With this file you will be able to print StandOffs with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on StandOffs.