Your design skills are looking better. It's good to see others embracing 3D printing for bicycle accessories. I have done well with Di2 compatible mounts as well as some of the rear mounted GoPro/Virb/Sony camera mounts.

If you want something that is as easy to extrude as PLA but with the strength of ABS, try using PETG. It is made from recycled water bottles and is usually transparent, although eSUN has come out with solid black and white PETG.