Freestanding Filament Roll Holder

A simple freestanding filament roll holder for filament spools with a 30mm diameter hole. The axle rod is an 11.5cm piece of 8mm steel rod, onto which I cut threads on each end. Alternatively, a piece of 8mm threaded rod would work as well. I cut threads into the end-caps with an 8mm tap.
The cross braces are pressure fitted to the main stand pieces. They should fit as is, but may need some filing.