Hi Jaco, can you send your gcode to our support team ? They will print it and see if it’s workable. By the way, it seems you don’t have proper cooling in place, or there is another problem with extrusion quality - please contact us on livechat or at firstname.lastname@example.org, we’ll help.
If balls fuse with bearing due to small gap, just decrease voxel size.
Regarding top infill - we know it happens only on Mac, it’s being investigated.