I printed [Planetary Gears][1] and the top looks great[![top][2]][2]
but the bottom doesn't[![bottom][3]][3]

I am printing on a TronXY X3 (Prusa i3 metal frame clone) using eSun PLA+ and sliced using Cura 2.4.  I print on glass and do manual leveling (sheet of paper to set gap).

What could be causing this?

It almost looks like a raft; but, I selected to print with a Brim not a Raft.

I have seen this on some other prints so I suspect it is a slicer setting.
Note: Bed adhesion seemed great.  First adhered well and part popped off with very little effort.

  [1]: https://www.thingiverse.com/thing:53451
  [2]: https://i.sstatic.net/Oq5DB.jpg
  [3]: https://i.sstatic.net/MKMDQ.jpg