I’m still at war with printing under Manjaro. My Brother MFC is set up via IPP.
I’ve noticed that the print quality varies greatly depending on which program I’m printing from (LibreWriter, Firefox, Thunderbird, Okular). One major problem is that Okular always has the “Force rasterization” option enabled in the print dialog by default. However, this rasterization causes the printout to be shifted and cut off at the edges. I don’t know what is responsible for this, but when I disable rasterization, at least the printout is complete.
My question is: How can I permanently change the default settings for the print dialog in Okular? I want to permanently disable this damn rasterization, but I haven’t found any instructions yet.
No idea about Okular, but wonder what will happen if you disable it at printer level? Maybe Okular will follow up. Or stop printing at all 
I do not know about on device settings and web settings of your device (start there first if available), but generally speaking, there is also a configuration file for the IPP devices with autodetected settings (stuff like ink levels and eco mode, etc). Those are usually also exposed in the printer settings, if you go in the printer control panel and right click on the printer. In some cases you can set more in the config file, but for now just look at the gui proprties. Maybe it is there already.
This is not a printer-level setting (I cannot find such an option anywhere in the printer or system settings). The setting must come specifically from Okular. In the printer dialog, it is listed under “PDF options.”
I never got along with Okular, particularly in printing.
My suggestion is to switch to to something formerly called papers, now renamed to Document Viewer. Still installable as papers, but when open, the window title is “Document Viewer”.
Whatever you choose to call it, it prints just fine, and IMHO, works much better overall.
I think it is officially called Evince.
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There are two suspiciously similar apps in the repo:
I have experience only with the installed one on the left.
For me all the 3 big viewers - evince, atril and okular, are very similar, especially evince and atril. Maybe this papers is the gnome clone of it.
I keep them all in case on some rare case there is a compatibility issue and some of them manages to open a document the other cannot. Has not happened yet.
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Since I will be switching to Ubuntu 26 LTS in the spring anyway, Evince is integrated into Gnome there. So I won’t be pursuing this issue any further. Thank you for your help.