I also wanted to print at night, and for safety I placed a small and light fire alarm above the electronics and close to the print board. The Z axis does not touch the sensor until 180mm. So the print will not be unanimous. The sensor is so light that I think the print is not affected elsewhere and is easy to remove when not in use.

The only thing you need::

- X-Sense Mini Smoke Detector (https://www.amazon.de/dp/B082FYH11T?ref=ppx_yo2ov_dt_b_product_details&th=1)
- 2x M3 10mm screw + 2x m3 nut

Printed with organic support / 40% Infill (less is also possible) 

Added:I updated the model a little bit by adding a hole above the step motor