We ended up getting at 900-t used. We have cleaned it thoroughly. However, anytime we try to use it, it put little black marks on the dough. It is like it is picking up dirt in the grooves. It is very clean when we start the dough so I dont know where it is coming from. We will run dough through it (throwing it away) after this break apart the unit and there is discolored small dough pieces in the unit. For those of you who own the 900-T, Any ideas?
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