UPDATE: I've uploaded a new design of the sides that adds an extra 1mm all the way around to reinforce the top section and prevent it from snapping.
I've tweaked the tolerances slightly, as the last one I printed, I ended up snapping one of the sides! Doh!
I've also removed the paint brush holder and added space for 3 more Citadel paints. It now holds 15 in total.
The author marked this model as their own original creation.