Corners to neaten and support soldered joints in LED strips (90, 120 & 150 deg).
Specifically for WS2812b, but can be used with any 10mm wide strip if the wire guides are cut out or the files are edited to suit.
EDIT:
Added "T" joints as requested. I have not printed these so I cannot verify they work, but they are re-mixed from the corners files and therefore should be OK.
2 Styles
LEDCornerTbase and LEDCornerTcover should take a continious uncut strip across the T
LEDCornerT1base and LEDCornerT1cover allows the strip across the T to be cut to maintain symmetry of all 3 legs.
LEDCornerTcover looks very fragile.

EDIT:
Also found powered end and cover on my PC

Double sided tape is suggested to stick the corner down.
The tape that comes pre-fitted to the strip is used to stick the the strip to the corner.
Snap in the inside of lid corner first, then the outside.
The lid is deliberately difficult to remove when stuck down.
The corners may also be used for RGB or any other 10mm wide led strips by cutting out the wire guides, or editing the files .
I found that my bed height was a little high so the 'flange' produced by the first layer needed trimming to allow the lid to seat properly.
I used PLA because that's all I had in white.
Please feel free to message me with any questions.