Shower drain plug w/overflow

Inspired by using using my bath plug with valve gadget over the last 3 years, I created this simple bath drain plug device. It allows me to shower but retain the warm water in the bath to simultaneously soak my feet. Rather than wasting it straight down the drain. If the water gets deeper than 60mm it simply flows down the overflow tube. This prevents the shower curtain hemline getting contaminated by it dipping into the used water.

There is also a stackable 10mm extension tube accessory in case you wish for a slightly deeper water level. Use TPU filament for durability and flexibility. It might work with PLA but I've not tried it. It fits into a standard 42mm diameter bath or shower tray drain.