I've done calibration test with "Concentric circle test" (https://www.thingiverse.com/thing:11895) and at specific points there are little bumped points on the print. Also Thingiverse page of the test mentions about these.
How can I solve this problem?
My printer is Creality Ender 3 Pro, I use Esun PLA+ with 210 celcius extruder and 60 celcius bed temperature.
Here is the printed object, both are same print, just took photo on different base.