Dumbbell benchpress leg protector (for pussies ;-))

I need heavier dumbbells for benchpressing than I'm able to properly lift with one arm. I came across the trick with using the legs pushing up the dumbbells. Because I'm using modular dumbells resting a dumbbell with 25kg on my knee is painful enough for me to create a helper.
This one is based on this thread (https://www.thingiverse.com/thing:3647414) and should fit for all 30mm dumbbells.