A simple way to get a nice clean ground install of your standard 12mm ws2811 pixels.
The nature of these pixels is that when the epoxy is poured in the bottom for waterproofing they often warp the "roundness" of the lights so this was the best I could so for sizing of the pixel holder. I found that the easiest method to installing them was to put the wires together, slip them through the slot in the holder and install it from the bottom. Some would slip in from the top pretty easy and some would break trying to get them in.
You can play around with the orientation of the print since standing them upright would result in the strongest clip orienting the layer lines in the direction of the stress that is put on them but I found that laying them flat worked just fine as well. I installed about 250 of them and only broke about 5.