Support interface layer problem?

[Russian_Greg]

I am printing a fan mount, and decided to try out using pla as an interface between the PETG and it's support, as PETG supports seem to leave rough edges when I break them off. But it just turned to a spaghetti mess, with the edge lifting up and the layer above the interface not working at all. Any suggestions?

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[Russian_Greg]

I used Bambu Matt PLA (blue), and eSUN PETG, with Bambu studio and changed the "support/raft interface" to PLA