This models are supposed to help if the original parts were lost, broken, partly damaged or had design issues. Using a drill to smooth out the 1.75mm filament “corridors” is highly recommended. The parts are recommended to print with: abs (the best),pla+(recommended temp:215-230),pet-g,nylon(carbon filled is really liked here),tpu(only washer). In case of usage in commercial printer, there's no need to do contact anybody.