Infill curling

Has anyone seen issues where the infill starts curling? This has happened all of a sudden since updating SW and FW. Have troubleshooted many things but wondering if anyone else is seeing this.

Part on the bottom right illustrates the issue. Top layers get really ugly because of this.

I had the same problem. It was dirty carbon fiber rods on the hotend. Cleaned as per BB wiki fixed it. HTHs with problem.

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Thanks! I did try this and it didn’t help…but maybe ill do it again more thoroughly. Cheers.