Summary It's very hard to achieve exact gap between these tiny and cheap neopixels without some kind of helping device. So I decided to make for my own purposes jig for soldering those tiny LED pixels. But after it was done, I thought that today I need gap between them with just this size, but maybe in the future I liked another numbers. So customizable jig was born. Maybe it helps somebody else too... Instructions As soldering emits some heat, then it's just a wiser to make this jig from ABS.