Chair Wheel Stopper - no lefting needed

You dont need to left your chair to block the wheel, and no uneven feet height will happen when you block your chair. And you only need 1 or 2 stopper to block your chair.
Need practice a little bit to make it fast and smooth to set up. 
Put 1mm self-stick rubber pad on the bottom.

Hope you will like it.

I think work for most of the  50mm wheel. If to loss, try to pint in smaller scale.

I printed with PLA+ / 0.2 layer height / 6 outer layer / 25% infill