Lack Original Prusa Spool Holder Adapter

With two 1kg spools it has a little flex but not to a point where I feel like it's going to break.

You can probably get away without using any screws, but I used them anyway to make sure it's not going places.

Make sure to use plenty of perimeters for strength (~5) and about 30% infill. 

If you plan on enclosing your printer later on, you might rather wanna use one of these top-mounting adapters like this, this or this.