Sourcing Materials

LED

addressable LED

WS2812B MINI – 3535 RGB LED
50 for 20 Euro at ebay

WS2812B LED 5050 RGB/
50 for 15 Euro at Segor

4020 side WS2812B IC in LED Chip Side lighting SMD
https://www.aliexpress.com/

WS2812B MINI
http://www.normandled.com/upload/201607/WS2812B%20Mini%203535%20LED%20Datasheet.pdf

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Optic Fibre

2mm side glow
2,0mm LWL Lichtwellenleiter Lichtleiter seitlich leuchtend 2m
8.95EUR
https://www.leds-and-more.de/catalog/20mm-lwl-lichtwellenleiter-lichtleiter-seitlich-leuchtend-p-1940.html?osCsid=2me5dl4q5amcvgb6tnbqfd87i5

https://fr.aliexpress.com/item/12000m-roll-High-quality-0-25mm-PMMA-Plastic-Fiber-Optic-end-glow-cable-for-Ceiling-lighting/32296328210.html?spm=a2g0s.9042311.0.0.40696c37MzwGed

https://fr.aliexpress.com/item/rgb-led-flashing-light-2mm-Plastic-side-glow-optic-fiber-for-shoe-sole-clothes/32504362608.html?spm=a2g0s.9042311.0.0.27426c372UloV5

https://fr.aliexpress.com/item/rgb-3mm-Plastic-TPU-side-emitting-optic-fiber-for-led-light-dog-collar-harness/32505780005.html?spm=a2g0s.9042311.0.0.27426c372UloV5

2mm inside casing intended for data com:
>> https://www.digikey.com/product-detail/en/industrial-fiberoptics/810004/FB140-1-ND/356536

Optic Fiber Housings

DIY solution:
>> https://www.instructables.com/id/Build-a-simple-Fiber-Optic-tester/
>> http://www.l-com.com/fiber-optic-simplex-and-duplex-plastic-lc-fiber-optic-couplers

HFBR-0508Z Series Fiber Optic Transmitter
>> https://docs.broadcom.com/docs/AV02-1504EN

AVAGO SFH756 / SFH756V Plastic Fiber Optic Transmitter Diode Plastic Connector Housing
>> https://pdf1.alldatasheet.com/datasheet-pdf/view/535897/AVAGO/SFH756V.html

IF D91 Plastic Fiber Optic Photodiode
>> http://i-fiberoptics.com/pdf/ifd91.pdf

Not intended for optic fiber but also a tube-like housing mounted on PCB:
>> https://www.mouser.com/datasheet/2/464/IDT_FS2012-Datasheet_DST_20180824-1143655.pdf

Tube

Brass tube ( ø 4.0 x 0.45 l=1000 mm )
https://www.modulor.de/en/round-tube-brass-oe-4-0-x-0-45-l-1000-mm.html

Copper, Brass, and Bronze tubes for fabrication:
>> https://www.mcmaster.com/standard-metal-structural-tubes

VINTAGE BRASS ” TUBE SPACER” 2 MM I/D X 10 MM LENGTH Pkg. Of 100 Solid Brass
ebay.com

Lens

Optical Light Pipe
http://www.dialightsignalsandcomponents.com/Product/List/Through_Hole_CBI_Single_Element_Optical_Lightpipes

PCB