I am having trouble with my 3d printed glock mags.I am finally getting them to load all 17 rounds but the mag keeps they show a slight crack in them and if i apply enough force the mag will split further until it snaps.my initial problem was the slicer i was using,it was setting my wall thickness to 0.8mm and i could not get past round six.now that i switch to cura i reallized by default the wall thickness is set at 1.2mm.so now i am getting all 17 in but it shows a slight crack.can someone please offer me some advice?