Domintushe tushe, Gabaɗaya, idan siffar ƙirƙira ta kasance mai sauƙi mai sauƙi, ƙananan mutuwar mutuƙar yawanci ana amfani da su azaman babban rami don daidaita samfurin, kuma mutuwa na sama na iya zama mafi sauƙi ko ma amfani da maƙarƙashiya. Idan siffar ƙirƙira ta kasance mai rikitarwa kuma an saita farfajiyar rabuwa a tsakiyar, rami yana buƙatar a tsara shi don mutuwa na sama da ƙasa. Gabaɗaya magana, babba da ƙasa suna mutuwa(mold tushe)ana amfani da su don ƙirƙirar ƙirƙira. Mutuwar ƙasa yawanci tana taka muhimmiyar rawa kuma na sama shine mataimaki. Duk da haka, akwai lokuta na musamman. Idan ƙananan mutu gyare-gyaren ba manufa ba ne, za a iya amfani da babban mutu a matsayin babban rami, saboda juyawa extrusion forming zai zama da sauki. Abu mafi mahimmanci shine ganin siffar ƙirƙira.
