I was so impressed that I wanted to do this myself but a search on the interwebs for a printable model drew a blank. I guess I have to model my own then.
The spell description describes two modes:
A shimmering, multicolored plane of light forms a vertical opaque wall—up to 90 feet long, 30 feet high, and 1 inch thick—centered on a point you can see within range.
Alternatively, you can shape the wall into a sphere up to 30 feet in diameter centered on a point you choose within range.
This lenticular paint job won't work on a sphere (no straight lines to hide the colour shift) but six straight wall sections could be arranged into a 15 foot circle (ish) or a 30ft semi-circle (ish). Two birds one stone... Job done.
I design my models in Sketchup, which turns out is not the best software for printable models, but I love how easy it is to use. It often creates STL (STereo Lithography) files which are a bit sloppy and not what is known as "Watertight" or solid. In practice this means that they can often have faces missing, internal geometry and be unprintable.
My workflow to getting a printable model is to export the STL from Sketchup and import it into Tinkercad. Check that there are no holes, if there are go back to Sketchup and delete any faces which might be hiding inside solid areas of the model and repeat the process until Tinkercad is happy.
I also use a fabhouse service called i.materialise.com where I can do a second pass check to see if the model can be printed. This also allows those without a 3D printer to order a model in their material of choice. The example above in Polyamide (Selective Laser Sintering) would cost £11.14 ($13.85) each and discounted to £55.68 ($69.23) for 6 copies in white.
This model is free to download at: https://www.thingiverse.com/thing:4292839. If you like or make one click the heart, post a make photo and add a tip to the jar.
I will be painting my wall in Part 2 so stay tuned to see if I can master the lenticular paint effect.