you could fix a PU-Foam spitting can, and try printing big pink foam objects like a pink pig or a foamy chair. Or you can try experimenting with milling or putting your favorite extruder on it and see what happens.
- Use of drive belts would probably fail due to the size of the belts. Their slight expansion would be amplified over such distances.
- Build surface must be capable of supporting and removing very heavy items.
- Safety: panels on the sides may ensure small children and pets don’t become extruder bait.