Print on the side, without supports.
Each support requires a 3030 M6 T-slot nut and an M6x12 screw.
In my experience it is sufficient to have 2 supports for 50cm of rail.
Suitable for 17x17mm aluminum LED strip rails/guides, e.g.: https://www.amazon.de/dp/B07549CLDV?ref=ppx_yo2ov_dt_b_fed_asin_title
The author marked this model as their own original creation.