I'm building number 4 CNC, and tried different couplers. this is the ONE for you - solid couplers, and can re-used many times.

I built the cnc#3, and this is the best couplers so far.

Very good product,I Will continue to purchase ZYLtech products because of the quality and dependability.

I switched from spring couplers, open builds, to these hoping they would resolve some z axis artifacts I was seeing on my corexy. I'm happy to say they really helped and in now getting very consistent layers.