That would require to printing at 10000%, don’t forget increase the perimeters to about 500. The whole thing might take a little bit longer to print.
But there is a new technology around which might be an alternative, it’s called carpentry. Supposedly involves wood and steel tools!
But also a word of warning, there has been a bit of a discussion about the merits of certain siege equipment in the comments below. Building a huge catapult might bring you in conflict with the trebuchet faction. So print some halberds and cavalry sabers for defense!