I'm printing out specimens to test font spacing. The font is OTF and autohinted using Glyphs, the specimens are assembled in SILE (which is Harfbuzz under the hood) and I'm printing them out with a FujiXerox ApeosPort-V C4476, quite a decent laser printer. But the spacing is looking very different on the page and on the screen. I sort of don't know who to trust any more!
Here's a photo of the screen:
The l is nicely centered.
Here's a photo of the printout:
It looks to me like the "l" has shifted over to the left on printing and is no longer centered.
This is with an A4 printout of the specimen at 12pt. The effect is not as pronounced when the specimen is printed double size. (magnified to A3 size)
What's going on? Bad printer rasteriser? Bad hinting? Something else?