Print with many (>4 perimeters) for additional strength.
Use OpenSCAD to change the number of tube slots and their size.
Use SKADIS universal hooks to add this to your board: https://www.printables.com/download:4801557
Based on this model by ThaliaFP, but completely rebuild in OpenSCAD. https://www.printables.com/model/61955-ikea-skadis-acrylic-paint-tube-holder-schmincke
The author remixed this model.