My ceiling has some beams across and I couldn't install the lamp directly on the ceiling. This is an extension so  that the light clears the beams. It fits pretty well. I have printed it with PLA but probably it is a better idea to use a material more resistant to heat like PETG or ABS.

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This is the light I installed: BRILONER Leuchten 3136-018 LED Ceiling Light, Dimmable with Memory Function, 2 LED Modules Rotatable, 43.8 Watt, 3,300 Lumens, 3,000 Kelvin, Chrome Aluminium, 928 x 260 x 96 mm (L x W x H) : Amazon.de: Lighting