In rough order: (1) towers not parallel/square — every cut is skewed; (2) a slack wire — it bows, lags and drifts; (3) wire too cold or too hot for the feedrate — tearing or melting; (4) sharing one power supply for wire and electronics, causing noise and missed steps; (5) building too big, which kills rigidity and adds wire sag; (6) no spring tensioner, so the wire goes slack the moment it heats; and (7) running heat current through the frame instead of an isolated wire.
Fix the geometry and the wire first. Almost every 'my cuts are bad' problem traces back to squareness, tension, or the heat-versus-feed balance — rarely to the electronics.
Fix the geometry and the wire first. Almost every 'my cuts are bad' problem traces back to squareness, tension, or the heat-versus-feed balance — rarely to the electronics.