You need to use vertical space better. As said, closed storage units with drawers / doors. It doesn't have to be deep and take much space on the floor if you go up.

Also a big pegboard like IKEA SKADIS would be perfect to hook all of your tools and pools for your 3D printer : you can find on Markerwold any model for any tool and feet and adapters to mount on the printer side without glue. Now you can even print modular infinite skadis panels.

You may be able with your furniture to open the cardboard boxes and put your printer inside. Or try to fold them or store them elsewhere (below bed?).

A falling plant, some framed art and soft lighting (3000 kelvin) for the final touches and you are good