Since Fab365 designed the Foldable Robot, there have been many requests to design the Wall-E in a foldable way. This is because Wall-E is optimized for foldable design. However, the shape optimized for foldable is only the body, and Wall-E's head/eyes, arms, wheels and track are a challenging shape with many factors to consider.
Now that we too have gained a lot of experience, we now have the skills to create, and finally we can design like this.

STL- https://fab365.net/items/321

Please enjoy the foldable design skills that Fab365 has accumulated over the past 3 years with the Foldable Wall-E.

This is Fan art and FREE
I printed on Ender 3, Ender 3 S1 to make sure any FDM 3D printer can print this design.

Here are some things to keep in mind when making Foldable Wall-E.

When folding the body, make sure to check the positions of the protrusions and holes before folding.
The parts attached to the upper corner of the Wall-E's body have a small adhesive area, so it is recommended to apply the adhesive carefully before sticking.

The neck must first be pushed up and then rotated before it can move.

The arm moves along the rail. On the lower rail, it moves well when the arm is forward, and on the upper rail, it moves well along the rail when raised up.

To make the track move well, it's a good idea to grease the wheels with sewing machine oil.
If the tracks are well separated, it is helpful to increase the flow rate.

Largest part in printing, size = X 160mm, Y 184mm, Z 25mm