This allows hanging the tool holders on the splash guard of a small lathe; I designed it for [1], but I'm including the source FreeCAD (0.17) file in case anyone needs other dimensions
[1] http://www.banggood.com/14-38-Inch-20x25x50mm-Turning-and-Facing-Holder-for-Quick-Change-Tool-Post-Holder-p-1058488.html
Technical
I printed mine in PLA at 0.2mm, 3 perimeters, 50% infill; It doesn't need that much infill, though, you can get away with a lot less, maybe even making them empty (they aren't going to bear any significant loads)