Found a model by daviferna that was easy to print on my tiny printer, but it looks a bit rough so I redesigned it a bit.
List of changes:
Rounded off all the sharp corners and made the middle part thicker to transition better between the top and bottom.
Pushed the hole for the brush further away from the middle part to make better room for the hairs of the brush (some of the space had been removed when I made the middle part thicker.).
made the tips of the top part longer to support the brush handle more and rounded them off.
Pushed a bit of the bottom down to make a small dish to catch any water drops (not that they would run off of the original.).
I split the middle part into two to make it printable without any support.
If the two middle parts cannot fit into the slots due to differences in tolerances between our printers, try scaling it in your slicer to make a thinner one that you can print out.
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