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Hi Stefan,
I noticed that:
2 x MGN12H 405 mm
1 x MGN15H 470 mm

Why is it 12 for the Y and 15 for X? can it be all 15? also I saw some ppl have put a 2020 extrusion on X... I assumed that 15 is good enough that it does not need a 2020 extrusion for support?

(I am thinking about changing all of my rods to rails instead)
(also how does it fit a flag for endstops (optical?) just CAD it and add a flag (X & Y) on top of the left XY holder?