Cut your strip every 3 LED, or the cutting line indicated on the strip. Wire this to your 12V input/output on your board or PSU.
Glue the curve plate and one of the long plate with superglue or by PLA welding method.
You can mount it using M4 screw or just tape it onto your printer.
This is made flimsy/bouncy so you won't break it accidently.