Tennis ball rocker foot for increased comfort on your Wahoo Kickr V5. Probably works with other Kickr versions but not tested. Ball diameter is 65mm which should fit most tennis balls. There is more than 2cm of vertical travel space which allows a decent amount of rocking motion.

I printed it using PLA with 1.4mm top and bottom layers, and 1.6mm shells. It is pretty sturdy but I haven't done a long term test yet.

Pro tip: Buy tennis balls for pets (dogs) which are cheaper. 

I added fixing pin models for holding the ball rocker in place, it might slide along the leg without this.

Note: I designed the model based on my trainer's dimensions, the hole might be too small for your trainer's legs. To be on the safe side, print several layers, stop the print and try it on your Kickr. You can simply resize the model and try again. Someone commented that 102% worked for them.