armchair cupholder riser

We have this sectional sofa with built-in stainless steel cupholders… but putting a cold drink into them causes them to sweat, and the cup sits in the pool of gunky cold condensation, which winds up dripping onto your lap and just being gross. I made these little perforated riser things to help alleviate the issue. These cupholders are about 90mm in diameter, and 70mm deep. The large hole in the riser is there so you can easily lift it out with a finger.