speedway ruima mini 4 mudguard - one piece

This is simple remix of mudguard for Speedway ruima to be printed in one piece. Current version was printed without support, with 10% infill and triple walls to test the fit. It fits well and is robust enough for test rides.

Update: part lived for several months until severe bump broke it. Replaced by modified version without holes, 15% infill and 5 layers walls