Hi, all this is just a simple retraction test I threw together. 

When printing, it's best to start on a lower retraction value and build your way up slowly by something like 0.2mm each time, bearing in mind the max retraction you can get away with on your machine. For example, if I go above about 1.5mm, I seriously risk damaging my printer because it's sporting an all-metal and is direct drive. If you get to a high retraction setting, it's best to look into other settings, like combing mode, to see if your problem is something else.

Update: I've changed the design, so I've uploaded it and set it as the cover photo. the old design is still going to be here, though.

Print settings:

0.2mm layer height

100% infill