Control knob got stuck then snapped off and I don’t know what to do.

I was trying to use my CR-10 which I had just bought, and the knob started getting stuck every so often. I didn’t think much of it until it permanently got stuck in a compressed position and then snapped clean off when I tried to jimmy it free. Now I don’t know what to do. Are there replacement assemblies that I can buy and install, or is my printer just officially done for?