Studio Neat Cosmonaut Case and Cap that replicates cardboard one it came with giving it a similar "pop" as you lift off the cap for the Cosmonaut Stylus. There are two versions of the body aka case, there's one with grips and one without. The cap will fit both.
Recommended settings:
Detect thin walls enabled
0.25mm print settings
print single object (cap or case) at a time
The author hasn't provided the model origin yet.