Rail vehicle with gauge of 80 mm usable as a ceiling lamp holder. The model is designed in the style of some tram or funicular with the safety hook in case of derailment. In addition to attached files you need 2 nails 100/4 mm (as axle shafts), 8 washers (2 between each wheel and chassis) and some lamp socket which fits into the chassis hole. Then you can use any bulb you want, but consider the right printing material relative to the posiible bulb temperature. For my fluorescent tube PLA is OK. If you don't have lamp like this, you can get ispired by the thing or modify it for your purpose.
Consider the right printing material relative to the posiible bulb temperature.