Slicing Mess

[Xhroy]

Hello everyone

I want to print a rectangle with a thickness of 0.52 mm on a sloping substrat part with a 45° inclination. So I pre-sloped the rectangle at 45° in cura and want to slice it from the top surface of the rectangle in the normal direction (in the direction of the red arrow in the picture)

But after I set the parameters in the scripts, the result is as shown in Figure 2.

Does anybody know the reason or Is it because my idea can't be realized?，thank you