Geeetech i3 Pro 8mm Acrylic filament holder & mount remix

The filament holder designed by msmith358 is great, but needed improving. The side panels had some polygon issues, and weren't printable on all platforms, so I fixed that. Also, there was only room for short screws. To improve flexibility, I redesigned it to allow longer screws as well. I only happened to have regular drywall screws lying around, and they work great on this new remix, as should a lot of others now. Flexibility is a good thing.

Also, I think the new curvyness really looks