This is a fairly high precision model. Your printer should be accurate to 1/10th of a mm or less for best results. You may want to print at 40% infill and 3 perimeters for strength.
You will need to print 6 of the planet gear, 2 of the ring gear, 2 of the mounting bracket and one of everything else. There is an assembly instructional video that you should probably watch before attempting to put it together.
Linked here:
The author marked this model as their own original creation.