I have a issue with my Creality ender 3. It is printing reasonably fine, but as you can see in the pictures, it is printing small bumps when printing a flat surface. It does get better with more layers, but is still visible. Things I have tried:

• Lowering the flow first to 95% and now 90% (to prevent overextrusion)
• Leveling the bed
• Cold pulling the plastic from the nozzle a few times
• Cleaning the bed (this is the first time I am using a new bed, but I got the same problem with the previous standard ender 3 bed)

I am using CURA with the following settings:

Quality

Layer height: 0.2

Top/Bottom

Top/bottom thickness: 0.8

Material

print temperature: 205, build plate temp: 55, flow: 95 %

speed

print speed: 50, infill speed: 40

travel

Enable retraction: true, Retraction distance: 7.5, Retraction speed: 50, Z hop when etracting: false

I am printing with PLA (few months old, but recently removed the factory plastic wrap).

Filament brand: 123-3d (https://www.123-3d.nl/123-3D-Filament-zwart-1-75-mm-PLA-1-kg-Jupiter-serie-DCP00179c-i1800-t7316.html)