it ▁or ▁finished ▁products , ▁var ies ▁greatly ▁from ▁project ▁to ▁project . ▁This ▁rapid ▁development ▁of ▁open ▁source ▁ 3 D ▁printer s ▁is ▁gain ing ▁interest ▁in ▁many ▁spher es ▁as ▁it ▁enables ▁hyper - custom ization ▁and ▁the ▁use ▁of ▁public ▁domain ▁designs ▁to ▁fabric ate ▁open ▁source ▁appropriate ▁technology . ▁This ▁technology ▁can ▁also ▁assist ▁initi atives ▁in ▁sust ain able ▁development ▁since ▁techn ologies ▁are ▁easily ▁and ▁econom ically ▁made ▁from ▁resources ▁available ▁to ▁local ▁communities . ▁ ▁The ▁cost ▁of ▁ 3 D ▁printer s ▁has ▁decre ased ▁dram atically ▁since ▁about ▁ 2 0 1 0 , ▁with ▁machines ▁that ▁used ▁to ▁cost ▁$ 2 0 , 0 0 0 ▁now ▁cost ing ▁less ▁than ▁$ 1 , 0 0 0 . ▁For ▁instance , ▁as ▁of ▁ 2 0 1 3 , ▁several ▁companies ▁and ▁individuals ▁are ▁s elling ▁parts ▁to ▁build ▁various ▁Rep R ap ▁designs , ▁with ▁prices ▁starting ▁at ▁about ▁ ▁/ ▁. ▁The ▁open ▁source ▁Fab @ Home ▁project ▁has ▁developed ▁printer s ▁for ▁general ▁use ▁with ▁anything ▁that ▁can ▁be ▁squ irt ed ▁through ▁a ▁no zz le , ▁from ▁ch oc olate ▁to ▁sil ic one ▁se al ant ▁and ▁chemical ▁react ants . ▁Pr inter s ▁following ▁the ▁project ' s ▁designs ▁have ▁been ▁available ▁from ▁supp liers ▁in ▁k its ▁or ▁in ▁pre - ass emble d ▁form ▁since ▁ 2 0 1 2 ▁at ▁prices ▁in ▁the ▁US $ 2 0 0 0 ▁range . ▁Several