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There are these two cylindrical pipe objects sticking out the back of the EVA pod. What are they for? Who knows! They're not cameras or lamps, and exhaust pipes make no sense in space.
Anyway. Moebius moulded the thingies as very slightly tapered cylinders, for ease of moulding. And they made the inner surface flat with projecting ridges, rather than recessed slots.
So here are some more accurate replacement parts. They have perfectly parallel sides, the slight rounding at the end of the pipes, the shallow engraved ring, and slots cut into a flat vertical inner surface. All as they appear in the movie.
I've made two versions - this one which has the horizontal slots seen in the pod bay scenes, and another one with the vertical slots seen in the space scenes. You can't just take one of these and rotate them 90° because the holes in the Moebius shell are not actually symmetrical, and so these parts have been slightly squished to fit. Fortunately it's not something that's really visible to the eye - you need calipers to tell. The parts are sprued together to save money.
It's not possible to see the bottom of the slots in the movie. The space scene suggests some sort of gridlike texture, so I put in a kind of mesh texture after the engines of the Aries model. When it's painted flat black it's pretty difficult to see the interior, so I don't think it much matters what's in there.
Obviously like any 3D print, you may need to lightly sand the sides of the cylinders to eliminate any slight ridging caused by the print process. Also, you'll need to apply a bit of putty to fill the gap between the cylinder and the Moebius back. The same problem exists with the Moebius cylinders, incidentally - their parts have gaps also.
For completeness I've made this available in two grades of the "fine detail" plastic, but to be honest it doesn't really need the higher resolution print.