Brush Cleaning Cup Holder
thingiverse
I use two cups when cleaning my brushes, one with water and the other with brush cleaner. After knocking them over one too many times, I made a holder so that my clumsiness will no longer be an issue. The openings for the cups are 45mm, but this should be easily scaled in your slicer to fit cups of various sizes. I've included a version that has small 5mm holes to hold the brushes themselves.
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