Zonestar Z8 Z8XM2 Filament holder extension

The original Filament holder that comes with the Zonestar (Z8XM2, in my case) was not good enough. It can't hold any large filament spools, and is pretty flimsy. (See pictures)
As I do like the way this machine can hold it's 2 filament spools on either side of the machine, and because the filament-run-out-detection sensors are attached to the original spool holders, I designed an extension to fit on the original filament holders.
After using them for a while, I also added some clamps to preven