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Liners aren't all that necessary but you can use G10/Carbon Fiber/any plastic you can get your hands on, for them.From the pictures, it seems he has used Brass pins. You can also use copper/Stainless Steel
Tools and Materials for Laser Cutting
Welcome to Laser Cutting
Laser Cutting Class
Is it necessary to have the sideways tracking arm?And could you please explain why do we have to add a hinge on the tracking wheel?And what is a tracking wheel?And did a 2x72 belt fit into your original setup?(Sorry I have so many questions, I'm doing it the first time, and been saving up for it for a few months now. So just want to take every possible precaution)
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