Hi guys, Welcome to the Advanced Video Search Engine, and you are watching Prusa Bear Upgrade MK3.9 3d printer. That video is uploaded by 3DPrintronics - 2 at 2024-02-20T06:38:12-08:00. We are promoting this video only for entertainment and educational purpose only. So, I hope you like & enjoy it. [5KvkeOH51D8]