This is a remix of http://www.thingiverse.com/thing:3481426

I loved the original model with the folding wings. When I printed it, I had a tough time with the wings warping because I was printing in resin. So I beefed it up a little.

What I changed:
1 - Thickened the wings
2 - Enlarged the cross-section of the cannons for durability - They are still delicate!
3 - Brought the Back to wrap around the underside of the model. There are two versions of this file. The regular one should fit if everything in the world is perfect. However, in mine, I needed to make it longer. They are super tiny, my advice is to print both and see what fits better for you.
4 - raised the existing greebles on the Back for more visibility
5 - added some greebles to the wings

Post printing a very small file and a 1mm drill bit will likely be required still to get the wings to fit perfectly. I have been using the recommended cut paperclip as a pin with good success.
My advice is to take it easy with the CA glue around the back end. The wrap-around Back helps, but it is still easy to ruin the foldability of the wings with a bit too much glue...

Edit - April 29th, 2021 - Added two stls with the cannons joined to the wings. This may make printing and assembly easier, but I have not tested them.