3D Printing objects that are too big to fit on a 3D printer is easy if you know what you are doing. You will know how to do that by the end of this tutorial. If not I will most definitely would love to hear about it and try to get you back on your feet.

You will need the following for this tutorial.

3D Pen
3D Printed parts split at different points to fit on your printer in cad
Filament
Sand Paper or Belt Sander
Hot Glue

In this tutorial I will show you how to assembly a 3D print that is split into multiple pieces in CAD so it can fit on your printer in smaller individual pieces, assemble it with a hot glue gun, and fix the seam on it with a 3D pen and sand paper. Good luck to you!

https://www.thingiverse.com/thing:3192601

Step 1: CAD (Computer Aided Design)

I found blender worked for me for separating STL files from each other. There are other ways. Here are a few software for separating STL files in half.

Blender
Cura 15 or higher
Slic3r
FreeCAD
and more...

Step 2: Hot Glue, 3D Pen, Sanding, Oh My!

Firstly you need to hot glue your project together and do it so they are as aligned to the original model as close as possible.
Then you 3D Pen a seam around the edges.
Lastly you sand off that with sand paper or belt sander.

Step 3: Conclusion!

The possibilities are endless what you can do with this. Without painting the print after all this it won't be as pretty. I hope you enjoyed this tutorial as much as enjoyed making this. Thank you for reading it if you read the whole thing. Let me know of any questions or feedback because I am open to them. Enjoy!