For stuff that is going to take a load of some kind, I print 4 perimeters at 50% infill for petg. I also do .3mm layer heights. Thicker layers are stronger than thinner layers. Something to do with the extra thermal mass of the layer allowing better bonding between layers. The E3d guys have a write up about it on their site somewhere. All the parts but a couple of the feet are petg on my router now.