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I printed out the extruder carrier parts last night. I made them from carbon fiber PLA and they are plenty stiff. I did make some design changes to the bracket which holds the belt in place as well as the belt tensioner that should help further improve rigidity there. I am waiting on a hot end to see how it all comes together. Once I see if that works, I'll share the changes with you and see what you think.

So far, so good. It's a very nice design.