What Manufacturers did Cedar Fair cut ties with, partially or completely? What manufacturers did they stick with?

[TheAverageJuel]

I'm sorry if there's already a thread exactly like this.

We all know that Cedar Fair (now Six Flags) used to cut ties with Intamin, and we know why they did. But I want to know...

What other manufacturers did Cedar Fair cut ties with while it was still Cedar Fair, and WHY?

I also want to know, what manufacturers (besides Bolliger & Mabillard) did they continue to allow to build coasters?

 

[LightningColossus46]

Seemingly RMC. They got pissed after the Steve bump and structure issues. Railblazer has had some issues similar to the other single rails. Twisted Timbers has had issues related to loose articles. Shame really, there are some Cedar Fair woodies that were just itching for RMC to work their magic.