This is a printable model of the Spear of Longinus from anime Neon Genesis Evangelion. When all four sections are assembled the finished product is ~52cm long.
I am not the original creator of this model, it was converted from Steam Workshop files made for Source Filmmaker by Maestro Fenix, cleaned up in Meshmixer and cut into printable sections for an 18cm bed. During the cleanup and filling in Meshmixer one of the prongs ended up slightly shorter however it didn't bother me so I didn't pursue a solution.
I have included an .OBJ of the repaired model that is 52cm long in case anyone wants to modify dimensions or cut it differently than I did.
I have also included the raw Valve Source Engine rip (spear.qc) for anyone who wishes to work with it. I used the Source Engine plugin for Blender in order to import the model and then export it as an STL so that I could repair it. https://developer.valvesoftware.com/wiki/Blender_Source_Tools
Please post pictures if you make one, I'd love to see other people's results!
I am not affiliated in any way with ADV Films, Gainax, or Tatsunoko Production and do not lay any claim to Neon Genesis Evangelion or this spear as an original creation.
The most critical part I found was getting the support not to cling as due to the fragile nature of this model it is a somewhat tricky business and in my case I ended up with many small chunks of support left over to manually scrape off.