Attema/ABB Junctionbox stackable spacer

Hi, these spacers come in handy when you are renovating or building a house.They fit on square Attema and ABB junction boxes which are mounted in the ceiling. You could stack them if you need more hight, but you will require 2x M4 bolts and 2x M4 nuts.To properly secure the lid and possibly even a lamp or smoke detector you will need to slide in 2x M4 nuts as shown in the pictures.I've printed these myself in PLA, but PETG and ABS should also be fine.