UPDATE: 22DEC2019
-Added a base for storing paint brushes, uses same top as bottles to help separate them by type

UPDATE: 21DEC2019
-Added a 16 bottle organizer Base and Top

This is a fully modular 2oz acrylic/oil based paint bottle holder.
Print as many as you need and connect them all together as you accumulate paint.
I wanted a minimalist paint bottle holder that did not require a huge amount of time to print and was able to print more holders as needed.
The bases and tops all have a simple L-shape female slot where you can fit U-shape vertical posts when connecting other holders, or print the L-shapes if you just want a flush side support with no connection to another paint bottle holder.

4 Paint Bottle holder
-Print x1 4Bottle Base
-Print x1 4Bottle Top
-Print x4 L-shape or U-shape(for connecting other Bases/Tops)

16 Paint Bottle holder
-Print x1 16Bottle Base
-Print x1 16Bottle Top
-Print x3 U-shape Bracket
-Print x10 L-shape Bracket

Paint brush/tool holder
-Print x1 Brush Base
-Print x1 4Bottle Top
-Print x4 L-shape Bracket

NOTE
-Print the connectors laying long ways flat on the print bed and not standing tall in vertical position.
-If you have connector fitment issues then down size the connectors to 98-99% depending on the accuracy of your printer for snap tight fitment. I'd recommend printing your base and top first and then only print 1 connector to test fit being it does not take long to print those, print more as you find the scale that works for your printer.
-You should not need glue but if you wish to make a more permanent station then go for it but remember if you glue it you can't add more holders if L-shape connectors are glued.

Simplify3D settings I used:
-3 perimeters (bottom, top, sides)
-10% fast honeycomb infill on BASE and TOP
-30% fast honeycomb infill on L-shape/U-shape Brackets
-50mm/sec speed

Enjoy and send feedback if you liked it, needs improvements, or other ideas to improve the design. :)

Customization is endless!