Stackable modular paint rack

I really liked this design, I just wished it could be stackable so it can hold more paint bottles. So I made one.

I'm not that used to design pieces such as this one so the clearence of the parts is a bit higher than what you should need. As such glue is strongly required

However, if you don't wish to use glue, I believe horizontal expansion on your slicer of choice might help. I printed mine with an additional 0.15mm horizontal expansion (so it made the part thicker)