You aren't squishing your bottom layer enough.
There's "level" and then there's "level".
The latest leveling procedure with the card makes it so that when the z=0.3mm the nozzle is 0.3mm off the glass and that is where it prints the bottom level (by default in Cura anyway) and that is how much filament is extruded (enough to make a bottom layer .3mm thick).
This works great when you need dimensionally PERFECT parts - where the absolute bottom layer can't have a skirt - not even .1mm of skirt (not visible without a microscope or micrometer).
However this results in parts that don't stick well. So instead I level things a little lower (a lot lower). This way the bottom layer is extruding pancake-like brim or skirt. To achieve this - anytime after doing the leveling procedure (I rarely run it anymore) just adjust the 3 screws counter clockwise about a half turn. The next time you print something make sure the brim or skirt is squished flatter than nominal. It will stick much better.
Hi and welcome,
Adding a brim should definitely help.
Did you apply gluestick on the bed? You can also look for some 3d spray like 3dlac or dimafix to help for adhesion!
The first layer is crucial, it has to be squished enough to make sure that the print is well stuck to the bed, how is your first layer looking?
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