Adafruit NeoPixel Corner Mount

thingiverse

This is a mount to hold NeoPixel strips into a corner and point them "inward". For example, in a 3D printer enclosure, you can put these in the corners and they would point towards the center of the enclosure. Simple and effective. Attach it with 3M Command Strips, Velcro, or whatever you'd like. The STL is for one 70mm tall piece, but it works well scaling the Z axis up or down to suit your needs.