I wanted a mount that had some flexibility. Here is the result, its been tested for a while and so far held well. (Printed in ABS) Its almost all 3d printed and glued together with acetone slurry. Other bits are the bolts, the aluminum bush and the washers.Print all 3 using perimeters of 3, bottom layer of 2 and top layer of 3. Honeycomb infill off 20%. "Glue" the angles to the base at 90 deg using the acetone slurry. The parts will be a very tight fit however the acetone will allow them to slot together. Hold parts together for a minute or so. "glue" the back to the rest of the structure. I used an aluminum bush between the bolts washer and the mount as not to tighten directly on the ABS material.