Fixed some of the files from the original that had errors. Remixed to remove the blocks holding parts together (this is the big difference between this post and the other remix, i removed the old joints). some rebar from a local store should do fine, maximum width ~11mm. My rebar was nominally around 9mm, but actually measured 10 at the thinnest and 11mm on those lines at the side, so make sure you know what you've got. Hole goes through to the handle since I disliked the idea of only attaching the handle via glue and epoxy.
The hole through Blade parts 2/3 and 4 are /VERY/ slightly elliptical for this reason, shouldnt cause any problems. Depending on your Printer's tolerance you may need some force to slide them onto the rebar, but hey if it works that way you wont ever have to worry about it coming apart eh?

The total length of the hole within is 908 mm. You can add to this without making larger parts by stretching the handle a tad, since thats the smallest part with the hole, or shrink it by shrinking the large center blade portions or omitting them altogether