There are two springs (if I remember correctly) in the sensor carriage, one on each end, for pressing the sensor assembly against the glass. If you’re missing one of the springs, the sensor won’t be parallel to the glass, which could cause the warping you’re seeing. The white plastic parts at the ends of the sensor carriage should both be pressed against the glass.

There isn’t any “hardware” calibration in the Canon LiDE scanner models (except for the newer 300 and 400 models). Everything is handled in the driver / scanning software. About all the scanner itself is capable of is to receive sensor configuration and motor movement commands and to return lines of data from the sensor. The calibration is done in software and wouldn’t explain the issue you’re seeing.

No, I’m referring to the side perpendicular to that. The area you marked in the area where the sensor carriage presses against the glass, so there’s no way to remove that.

Am I right in thinking that when you talk about the ability to cut the glass without compromising performance, you are referring to the area marked in red in the following screen? — https://i.imgur.com/HOcGq0U.jpeg

I need this feature to try a V-shaped scanner design, where the scanner would be at a tilt and scan the right or left page of a book half-open underneath. And therefore need the scanner to be as close to the inside of the book as possible. The idea is to automate such a design over time.

(Sorry my english)