Rocky the Eridian from Project Hail Mary

Updates are likely to follow.  
To make Rocky in the presented pose, you only need to download and print two files: “carapace” and “all legs”. 
The holes in the body are there to put rubber bands in and tie the legs in the joints. Drill holes through the indentations in the leg ball to catch them with rubber bands. 

To pose him differently, choose a different combination of legs. 
If you want to permanently fix the legs in place, melt a piece of filament inside the hip socket with a soldering iron and press the leg in. 
In the future, I might modify the joint design to be press-fit. Perhaps. Maybe. :)

Have fun! :)

Disclaimer: the astronaut model comes from MS 3D Paint. I added him in the pics to visualize Rocky. Of course, the astronaut is not mine.