I found SLS printing guide, it says all holes should be larger than 1.5 mm diameter. My minimal size is a 2.5mm, maybe I will change it to 3mm, but what I am trying to figure out, is a hole and pin size compatibility, mostly I need free rotation and cylindrical sliding. For example, if I have hole 3.2mm, my pin is 3mm, but I'm not sure, if it is not too little or not too much, how nylon behaves in this case