Square Peg Thru Round Hole Pass Thru (with a Twist)

I decided to try an alternate approach to making a pass-through model by changing the form of the guide rail used in Fusion 360.  The result is interesting both in terms of the shapes involved (Square & Round) but also since the Square Inner piece will easily pass through in one direction but not back through (unless it is flipped end-to-end).

PLA / 0.3 - 0.35 mm layers / 2 perimeters / 15% gyroid in-fill / No Supports