Emshinini wepulasitiki we-CNC (I-Digital Computer Control), ingxenye ikhiqizwa ngomshini ngobuningi bebhokisi lepulasitiki ngemishini yokugaya yedijithali.Lobu buchwepheshe be-prototyping obusheshayo bufanele ukukhiqizwa kweyunithi kumongo wokuhlolwa kokusebenza.
I-CNC machining yezingxenye ze-plastic prototype iyindlela ebizwa ngokuthi "i-subtractive" ngoba kukhona ukususwa kwezinto.Ukukhethwa okubanzi kwama-resin kuvumela izingxenye ukuthi zitholakale "entweni efanele", ngaleyo ndlela ivumela izakhiwo zemishini eduze nengxenye ebunjwe ngomjovo (ABS, PC, PP, PVC, POM, PMMA, PA 6/66).