These fan guards were designed to fit 40mm extruder fans that are held in place by two bolts at the bottom and nothing at the top (like my Flashforge Creators or older Replicators). These guards take advantage of the top two vacant holes to allow for a solid, clean-looking mounting point. Works with single and dual extruder printers (as seen above).

Take a look at the instructions for more details!

Comments and suggestions welcome!