Splitting large images for printing

I happened to have been tasked with a seemingly simple job — split a large image (size A1) into small A4 tiles for draft printing on a standard office laser printer. Couple of minutes of Googling only led to a some online services, either paid (come on, paying for cutting an image?!) or free with limitations on the maximal number of output tiles or on the size of input file.

Anyway, this is what we’ve got (scaled down):

We Buy Houses — Property Solutions
Large Property Solutions banner.

And this is what we want:

Desired cutting lines.
Desired cutting marks.

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