Every once in awhile something stumps me with my printers. This is a test print of some tiny little reinforcing panels for one of my bridge designs. The little dots are meant to be bolts or rivets. The print is done using a 250 micron nozzle and 125 micron layers in PLA.
The panels printed at top, in normal orientation are fine, but the ones that are rotated by 45 degrees are not. I suspect this is a belt tension issue but am not sure!