As you can visually see, the design of the rail mount has been changed. Aluminium channel wasn't going to fit in the space available and so I've used 10mm x 10 x 1.5 aluminium angle pieces which is 2.3mm away from the roller surface. The LEDs are 120l/m 2835's. ceil() has been used to make sure that the strip is longer than the X axis and that it is a length that is cuttable (every 25mm I'd assume).
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