This is my take on a bash guard for your bike. For me it fits with a 32 chainring, if you use a bigger chainring it will probably not work. I can upload a scaled up version if you give me the diameter of your chainring. 

I printed this in PETG with 2 perimeters with a 0.4mm nozzle with 30% honeycomb infill, with 0.2mm layer height. I printed this expecting I needed to beef it up, but it proved to be just right for me (I´m ~70kg).

I cant guarantee this will not damage your frame, and a big enough hit might still damage your chainring, but for smaller hits and sliding over stuff, it should work fine.