Z-Rex
Smash Cadet
They advertise this on the product page now....the plastic that sits on the top of the bowl had some excess that make it rock very unsmoothly. Took a knife and cut off a bit of excess plastic on the sides and it felt a lot smoother.
BTW that excess isn't there by mistake. It's normal, but expensive to prevent/remove. No biggie when you're making a million and each part is 1 cent, but niche products are made in smaller, costlier batches. It sometimes makes sense to leave the excess on to keep price down, especially if your customers are primarily savvy, cost-conscious hobbyists