It has happened to me in several cases, including those exposed
I WILL PUT OTHERS
1) Deviated transfer case
2) Feed foot improperly installed and the respective transport guide
3) poorly accommodated duplex
4) unevenly worn separation rubbers creating a vacuum in the sheet, which when passing through the fuser, sometimes the grain comes out, but more often when duplexing
5) uneven registration due to breakage of roller bushing
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