▁it . ▁Because ▁all ▁models ▁on ▁the ▁site ▁are ▁open ▁source , ▁this ▁behavior ▁is ▁act ively ▁encourag ed ▁by ▁the ▁site ▁and ▁community . ▁Design s ▁that ▁promote ▁illegal ▁activities ▁or ▁contribute ▁to ▁the ▁creation ▁of ▁weapons ▁are ▁prohib ited . ▁ ▁Many ▁ 3 D ▁printer s ▁can ▁be ▁upgrad ed ▁with ▁ 3 D ▁printed ▁parts . ▁Th ing iverse ▁users ▁produce ▁many ▁improvements ▁and ▁modifications ▁for ▁a ▁variety ▁of ▁platforms . ▁Popular ▁examples ▁of ▁community - based ▁ 3 D ▁printer ▁projects ▁include ▁the ▁Rep R ap ▁project ▁and ▁the ▁Cont ra pt or ▁project . ▁Some ▁ 3 D ▁printer s ▁can ▁be ▁almost ▁entirely ▁ 3 D ▁printed ▁themselves . ▁ ▁See ▁also ▁▁ 3 D ▁printing ▁ 3 D ▁model ing ▁ 3 D ▁sc anning ▁ 3 D ▁Print ing ▁Market place ▁Sk etch fab ▁. dw g ▁Pin shape ▁Material ise ▁N V ▁ 3 D LT ▁S cul p te o ▁Sh ape ways ▁Cult s ▁Th re eding ▁S 3 G ▁( file ▁format ) ▁ST L ▁( file ▁format ) ▁ ▁References ▁ ▁External ▁links ▁▁▁ ▁Category : Open ▁content ▁Category : So cial ▁information ▁processing ▁Category : Open ▁hardware ▁organizations ▁and ▁companies ▁Category : Free ▁software ▁Category : 3 D ▁publishing ▁Category : Internet ▁properties ▁established ▁in ▁ 2 0 0 8 ▁Category : 3 D ▁printing ▁websites <0x0A> </s> ▁M ash had ▁ol ▁K ube h ▁( , ▁also ▁Roman ized ▁as ▁M ash had ▁ol ▁K ū be