I would recommend to print it with the left or right edge on the sheet, you will need supports but it will look better.

20/02/2023 Update: the cover was a bit off by 0.3mm at the curve, however I managed to scan the shape from an original cover and used the scan to adjust the curve, now it should perfectly fit.

Note: I only own the models 1698 “Elite” and 1708 (also 1797 “Elite 2” but it doesn't need a cover), so the cover should fit both of them.