What can we improve in the hardware?

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These are all excellent suggestions!

@dlang

change the top post clamps to be more forgiving to longer rods, something along the lines of this that clamps around the rod rather than against the end of the rod Onshape

I forgot to mention that the linear rods will be more precisely cut (cut with a lathe instead of a saw) so they should all be exactly the right length with rounded edges.