HARD DISK GRINDER CORDLESS - SMERIGLIATRICE CON HARD DISK by iw4cdk on Thingiverse: https://www.thingiverse.com/thing:5329819

Summary:
My Projecthttps://youtu.be/3JpDn_ntDRII used an old PATA HD with 3 platters for a bigger flywheelBrushless Controller3 x 18650 battery connected in series to have 12vBattery holder and botton cover fix with strong biadhesive, arrow with glue