Alfawise U20 - Original corrected filament holder

The Alfawise U20 is one of the printers that provides filament support.
Unfortunately, this support has some defects:
* The length of the rod for filament bobbins is too short when the support is widened to the maximum.
* The flat shape of the rod for filament bobbins that can create irregularities in rotation.

To solve these problems, I designed this filament coil rod adapted to the original support. This way, you can adjust the maximum width and use 1 kg filament reels and allow a mo