Is there a general היתר of כיכר? (Bava Metzia 75a)

Rashi understands ר' יהודה אמר שמואל that לוין סתם refers to ככרות and that the חכמים are מתיר in any case. However, the Rambam and the Rif learn that even ככר is only מותר if there is a שער and this is how the Shulchan Aruch paskens. The Rama is מתיר like Rashi that a דבר מועט like a loaf of bread is permitted in any case.