Generally everything is good...actually great. HOWEVER I am doing some moulds atm and they are spherical. They are nominal 10mm shells with 3 layer perimeters and an overall infill of 5% (for prototyping). What is weird, that it seems to be going over the top of the perimeters with infill...very small movements very quickly and rattling the machine severely. What setting do I use to simply not fill in here?