Annex K3 Mild Steel Extrusion Backers. In mild steel these sit opposite the 4 XY rails between the motors. These are self colour, mild steel, as recommended by Annex for an appropriate CTE.
Self colour meaning they are raw mild steel, they will rust if you do not oil them occasionally, but printers are generally dry so it would take a while. WD40 would be enough. Personally I don’t bother. I will send them lightly oiled and sanded. They’re functional, not attractive, a bit like me. Reflected in the price 🙂
Set of 4.
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