This is a remix of Mangoa3D's Tamiya paint holder 36mm (Multiboard), with an updated design for Tamiya's 40mm-diameter (.78 fl oz/23ml) bottles. I've updated the size and relocated the screw holes to match a 7 UM wide Multiboard Tile.

Print using standard Multiboard settings (0.2mm layer height, 3 wall loops, 15% of your favorite infill, and no supports).

I recommend using Small Thread, Flat Head, Bolts for attaching this holder to the Multiboard tile.