Here’s a little something I threw together years ago to maximize space in my veg room. And it’s been a time saver with solo cuped plants. It helps keep plants from falling over and was even used for a full cycle solo cup flower challenge where I was able to harvest a canopy of solo cup buds at 16″ tall and never had a spill.
Very basic idea is plywood or particle board cut into 4″ wide strips and using a 2 1/2″ hole saw made holes to set each cup into. This idea can be used in strips like this and made into shelves for mounting along walls in a garden. Or as a sheet to keep a sea of green/amserdamn table method upright.