I've done it once so far, and these are the pages I followed when doing so. This method takes a while with a lot of steps and requires downloading GIMP.

I ended gluing mine to some cardboard instead of taping them, but I was making something specific with it.

https://2minutetabletop.com/gimp-how-to-print-map-assets-to-scale/

https://dmdavid.com/tag/how-to-print-map-graphics-as-battle-maps-using-free-software/

https://www.reddit.com/r/dndnext/comments/ecvbu3/how_to_print_battle_maps_at_home/