If you haunt some of the CNC areas they spend a lot of time figuring out what is best (this week) in the world of spindles. I have not gone any deeper than simply reading along with some of it. I do know (all to well) what a carving tool sounds like compared to a "real" milling machine.
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If we are going to do this (more or less) right - deciding on things like arm materials would be a good idea. The right objective is to come up with some printable parts that others could use to build printers with. I'd like to be sure that what ever we pick is reasonable over some range of applications. The 6' printer I came up with early on is likely beyond the range of "reasonable". Defining what's reasonable is never an easy thing. It's going to be a decision each of us will make.
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If we are going to do this (more or less) right - deciding on things like arm materials would be a good idea. The right objective is to come up with some printable parts that others could use to build printers with. I'd like to be sure that what ever we pick is reasonable over some range of applications. The 6' printer I came up with early on is likely beyond the range of "reasonable". Defining what's reasonable is never an easy thing. It's going to be a decision each of us will make.