Printed Model of Motor Cooling Fan Breaks Apart When Operating

[JimmyJack121063]

I had a model maker design an electric air compressor motor cooling fan due to the fact that I broke the original one and they are now obsolete and no longer available. The fan mounts on the end of the crankshaft that turns the air pump, which is on the end of output shaft of the electric motor. The motor is 3450 RPM. The guy who designed the model has made several modifications to make it stronger, but each one has broken into several parts after a few minutes of operation. I have noticed that if you hold the fan in front of a light, you can see several pinholes in the blades. I have tried increasing the infill to 100% and changed some of the strength settings to no avail. The fans still break apart after a few minutes of operation. Does anyone have any ideas of how to correct this problem or is a 3D printed fan just not going to hold up to the axial forces? I am printing this with PETG and have used both a 0.4 and a 0.6 nozzle.