The grid held between the two cylinders was made from a ceiling louver with colored resin poured into the louver cells. If you are unable to find the correct ceiling louver, or if you don't have the setup to deal with resin, then consider using a 3D printed grid and laser cut acrylic pieces to fill in the cells.
Alternative
Type 3 Grid STL File
The Etsy store DelviesPlastics can supply acrylic pieces for the grid cells. These are .25" thick, so you need two pieces for each cell since the grid is .5" thick. The quantities listed below take this into account, and include extras of each color in case they are needed. Contact the store and request a custom order. Each piece should be .5" x .5" and .25" thick.
- 28x 2423 clear red
- 22x 2069 clear blue
- 34x 2208 clear yellow
- 58x clear
Additional Information
Type 3 Grid Cell Color Guide