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Diffusers for Essential oils have become very cheap in the past few years. I have noticed there is a general size and form to the cheap ones sold on Amazon. They typically come with a pre-measured water cup. So I wanted everything to stay in one place without the risk of loosing the little cups and perhaps have a few oils to have on hand for easy refills. So I quickly wiped this up. Its a simple design that made the most since to me. Four slots for the standard Essential oils bottle size "Also works for a majority of off brand", recess on the top to hold whatever accessory you might need without it rolling away, space in the back for the fill cup, and drain holes.
This is washable if you get a spill or oil leak. Every crevasse has a drain hole allowing you to flush out anything you might need to get rid of.
PLA does not react well to some Essential oils. I have no idea what oil has a negative effect but I noticed one of my PLA containers half melted due to a small spill. I recommend PETG.
inland / eSun PETG
PLA or PLA+ is not recommended. Use PETG. No idea is ABS is ok with oils.