This organizer is made for holding the wrench from the "3dSolex Olsson Block" and holds nozzles 0.20, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0. A non-occupied screw hole indicates the size of the nozzle actually installed in the printer The wrench from Anders Olsson can be found here: https://www.youmagine.com/designs/nozzle-torque-wrench. https://youtu.be/wxNeOJ3Bybo Source file NozzOrg-1.0.SLDPRT : https://grabcad.com/library/organizer-for-nozzles-with-olsson-torque-wrench-holder-1