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You will need to print 1 Top A, 1 Top B, 1 Beam and 3 dowels. The UFO can be printed out of whatever material or colour you like. The beam should be printed out of a transparent polymer to get the desired effect of looking like a beam. I used a natural colour transparent filament in the photo description but you can experiment and use whatever colour you want, for example, red or blue or green. The lower the layer height when printing the beam, the better the quality.

Also when printing the beam I would suggest lining up the cutout facing the rear in your slicer and set the seam settings to the rear to align with the cutout. That way when you build your UFO lamp, any seams can be aligned and be hidden more easily. Make sure you do the same on the Top A and Top B so the seams line up. An easy way is to align one of the dowel holes to the rear for both models in you slicer, that way you're guaranteed to have both seams line up on the UFO when glueing together.

If the mating surfaces of Top A and Top B aren't completely flat use a piece of sandpaper on a flat table and give both surfaces a light sanding.

Once both surfaces are as flat as possible, install the three dowels to Top A, apply a light smearing of superglue between the dowels and then fix Top B to Top A aligning the dowels and the seams and press together and maintain sufficient pressure until the superglue sets. 

The LED light sits in the recess at the top of the beam, align the power cord with the cutout and press into place. The UFO slots on top and sandwiches the LED into place but still allows a vented space that can exhaust any heat out and through the windows in the top of the UFO. It also allows some ambient light to emit through the windows to give a more realistic look.

I recommend printing the floating person with black or a dark filament for contrast and it can be bent by hand to roughly mould to the curvature of the inside of the beam. Attach with double sided tape on the inside.

The light kit can be purchased on BambuLab's website under the maker's supply section, link below.

https://us.store.bambulab.com/products/led-lamp-kit-001?id=41806987395208&skr=yes

No supports are required and all the files are in the correct print orientation.

Happy printing.