This is a replacement set of sights for the Super Scope. It's almost a 1:1 copy of the original with a few minor changes for the sake of ease of printing.
It uses 3 M2 x 8 mm machine screws to hold the two halves together. You'll want to put the "Super Scope Eyepiece Front" in between the left and right halves of the body before you screw them together, as it has a small tab that captures it and allows it to slide in and out.
I recommend gluing the front sight piece down, and gluing the front and rear eyepieces together.
The two parts of the eyepiece shouldn't need any supports, but everything else probably will.