How do I keep the two towers square and parallel?

Question

This is the single most important build step on a 4-axis machine. If the towers are not parallel and their X/Y axes not aligned, the wire is skewed and every cut is off. Build both tower carriages **identically**, mount them on a common, flat base, and measure diagonally (corner to corner) to confirm the frame is square — equal diagonals mean square.

Use a steel rule or a known-square block to set the rails parallel, and check that the wire is perpendicular to the base at both ends with the carriages at the same coordinates. Re-check after tightening everything. A dial indicator or even a tape measure across several positions catches drift before it ruins foam.

Jak utrzymać dwie wieże w pionie i równolegle?

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