Hi, I finally got all the pieces I needed to start building, and with the exception of a few hiccups things are going pretty good. Except my centre piece has never sat snug between the two rails. I had hoped that when the belt was attached and tightened that that might make it fit better, nope! As you can see in the pictures by pushing on the top or the bottom of the piece I can get the bearings to lift off the rail by more than a mm. Which is enough that you can twist the piece between the rails.
I have checked it every way I can think of. Im using standard 3/4" EMT (23.5mm OD), which fits nice and snug in the rollers. I thought maybe my printer was messing the dimensions, so I imported the centre STL into fusion 360 and made some measurements. My print matched those dead on. Dan in the Your Builds topic Build PLOG. ZenXY LACK hack end table posted a video to youtube that looks identical to my problem.
Anybody have any idea whats my problem?