This is a simple U-Profile for an LED-Strip and an addition to https://www.thingiverse.com/thing:3722126
Instead of using an Aluminium Channel, you can print a holder for your LED Strip yourself.
If you want it longer or shorter, you can easily scale it on the y-Axis.
If you got a question or problem, pls contact me.
It seems like in some programs you have to scale it to 1000% to get the right size.
It should be exactly 39cm long.
Maybe you have to scale it to 1000%