Truck_V4_Frame_Dx(ACC) is an optional tray for counterweight/tech storage, requires a large printer or splitting.

Parts that need to be printed several of:

3x Truck_V4_Frame_Shockmount1
3x Truck_V4_Frame_Shockmount2
2x Truck_V4_Frame_D4(ACC)(if you're printing the other Dx parts)