Mawashin fensir - na'ura cewa facilitates wasa pencils. Akwai daban-daban kayayyaki ga fensir sharpeners - da hannu, ya yi daidai a cikin aljihunka ko fensir yanayin, sharpeners ga ya fi girma sa a kan tebur a ofishin (na inji da kuma na'urar). Kwanan nan, ko da yaushe suna da daki domin tattara kwakwalwan kwamfuta (samuwa a cikin wasu aljihu mawashin). Sharpeners amfani da translational ko rotational motsi daga cikin abun yanka zumunta da fensir. Kafin ci gaban ta musamman mawashin fensir fensir wasa wuka. Fensir sharpeners sanya wannan aiki sauƙin da ya ba da mafi uniform wasa mai fensir.