This Gridfinity bin can hold any nozzle with an M6 thread. There are 2 versions: one is stackable and one isn't. Overview The Gridfinity box is intended to hold any M6 nozzles. There are options for stackable and non stackable and also options for internal or external magnets. Printing Instructions Print in low infill (5-15%) and high layer height (0.2-0.32mm). External magnets If you printed the external magnets model 4x 6x2mm magnets can be glued in their holes at the bottom of the print after the print is complete. Internal magnets To get the magnets inside of the internal magnets print, either pause the print when the walls of the magnets holes are a a sufficient height so the extruder won't collide with them and place 4x 6x2 or 6x3 magnets in the holes. (A dot of CA glue in each hole can prevent them from rattling). Alternatively, in the slicer you can add a new colour on the layer when the magnet holes are covered up. During the print when the extruder docks place the 4 magnets in their holes making sure their polarity is compatible with the rest of you bins. Then don't swap the filament and resume the print. This is a lot easier and makes sure the magnets will fit without colliding with the print head. Original post from https://www.printables.com/@AdamRodrigues_606739 at https://www.printables.com/model/491720-gridfinity-nozzle-holder