Storage for your spare MakerBot Smart Extruder by admg consultancy. This will work on the 5th Generation Replicator, the Z18 and the Mini. This is a from-scratch design in OpenSCAD that I made to facilitate storage of spare smart extruders with the 5th Generation MakerBots. Especially useful at events. This is a finished design - I have in mind a more minimalist version which clips the smart extruder, but this is useful enough to share. Credits: 1) It makes use of br3ttb's MakerBot M logo in OpenSCAD form: http://www.thingiverse.com/thing:11105 Enjoy - and please post any feedback you may have.1) Print the .makerbot file. This is sliced at 0.2mm (200micron) layer height. It looks great in True Black (best match for your machine) or True Red. 2) Lift the filament store on the Replicator, or the lid on the Z18, and clip to the back of the machine. Insert your spare Smart Extruder.