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That’s chanelling you've got there. Firstly make sure you’re using high quality, freshly roasted coffee, then work on your dose / distribution / tamping. Best place to start is reducing your dose and going finer on the grind to give you a more compact coffee puck and less path of least resistance.
Neither the naked PF or the machine are causing it, it’s just demonstrating weaknesses in the preparation.
Edit; soz, didn’t see all the replies on the new page. ^ what they said.
Has anyone here with a Gaggia/Rocket/Rancilio ever experience some "spitting" when using a naked PF?
It seems my Classic does this a fair bit. There are some of the holes from the PF from which the coffee comes out with what seems to be more strength and in diagonal line therefore spitting coffee on my water tank, grinder and kitchen top.