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I’m working on a new design and instead of using one pipe to have the ball travel in, I am using two tubes and having the ball travel in between them. Would this be allowed considering the two tubes are enclosed tubes but the ball is traveling between the tubes and not inside of them?

Should be fine as long as the ball is never inside the tubes. Good idea! Flexible tubing?

As long as the tubes never completely enclose around the marble, it should be fine.

I'm bending metal tubes. I bend them with my hands, jk, I'm using tube benders to bend them into ski slopes.

Where do you have access to tube benders?

I have one at my house

You personally own a tube bender? Sorry but that seems a little extreme to just randomly own.

Is there an advantage of using tubes as rails, vs armature wire?

SPP SciO wrote:Is there an advantage of using tubes as rails, vs armature wire?

Well with wire you have to make sure the distance between the two wires stays relatively constant, while with tubing its a non issue.

Well with tubing there's "extra friction" and with wires there is less friction. I've been using wires and tbh there not as good as the tubing but once you align the wires right then it's extremely consistent.