Reply To: X/Y "stiffness" on centre assembly.

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Where have you seen that aluminum is fine?

The most common material is Steel EMT conduit. Unfortunately some brands are too soft. I had a set of rails wear out in a few hours of 3D printing, very minimal loading. I have tried everything I can get my hands on in the last year and a half.

You shouldn’t need a steel supplier, most countries have steel conduit, sold at a hardware store. Some don’t if you are in one of those countries there are lots of threads on specific suppliers, Australia seems to be the most difficult.