① Na farko na'urar busarwa ce da aka sanya tsakanin rukunonin launukan bugawa, wanda galibi ake kira na'urar busarwa tsakanin launuka. Manufar ita ce a sanya layin tawada na launin da ya gabata ya bushe gaba ɗaya kafin shiga rukunin launukan bugawa na gaba, don guje wa "haɗawa" da toshe launin tawada da launin tawada na baya lokacin da aka buga launin tawada na ƙarshe fiye da kima.

②Wata kuma ita ce na'urar busarwa ta ƙarshe da aka sanya bayan bugu, wacce galibi ake kira na'urar busarwa ta ƙarshe. Wato, bayan an buga duk tawada masu launuka daban-daban kuma an busar da su, manufar ita ce a kawar da sinadarin da ke cikin layin tawada da aka buga gaba ɗaya, don guje wa matsaloli kamar shafa a baya yayin sake juyawa ko bayan sarrafawa. Duk da haka, wasu nau'ikan Injin Buga Flexo ba su da na'urar busarwa ta ƙarshe da aka sanya.