Nema 17 Mount Spacer

I created this because I needed custom sized Nema 17 mount spacers. I have both 3mm and 18mm, but you can easily adjust the size up or down in your favorite slicer, or you can extrude one of any length you want from the design file. Yes I have printed these, and they do work. I don't have pictures of it, because it's a pretty basic part.