This model allows you to add headlights on the stem using threaded inserts using a 22mm bicycle extension bar you can buy off amazon. The stems usually come in 200-300 mm, i use the smaller 200 so its not much wider than the ninebot max.
Material requirements:
Threaded insert: M3, M5 and matching screws.
Recommendation: ABS/ASA, tho id opt out for asa since it will be exposed to the sun.
Resolution .2 or .3
The author remixed this model.