0881名無しさん@英語勉強中 (ワッチョイ c6b8-yExI)2019/03/21(木) 20:51:23.21ID:Qe5hnjOL0 today I'm trying to operate 3D printer which I bought last week. first reading the manual but couldn't realize the usage of the machine. but youtube told me that clearly. youtube is very useful.