Inspired by GlaDOS' Gridfinity Bin - Tamiya Paints/Bottle Holder, I designed this stackable Gridfinity caddy for the 36mm-diameter 10ml Tamiya bottles. 

This caddy will hold the bottle securely (to the point that you can hold the caddy upside down) but I have included a parametric file for those who might want a looser fit. The parametric file will allow you to increase the bottle diameter to 36.5mm without issues, but if you go larger than that you will lose the filleting on the tabs holding the bottles.

The original print profile uses PETG support interface for easier cleaning (and a silk-smooth bottom surface,) whereas the second profile uses standard supports for a faster (and non-AMS) print time.