I don’t know your material, but you can configure your extrusion in Bambu Studio in the filament settings via the flow ratio. Or the temperature at the nozzle is not high enough…
Gradually increase the value - for example from 0.92 to 0.94 or 0.95 - and see if it improves. The nozzle temperature should also be sufficiently high, but not too high.
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your nozzle could possibly be loose to fix it you would need to take out the nozzle and tighten the screws behind it. hope this helps 