The 3D printer can emit unpleasant odors, for example when printing ABS or TPU. Even the lithium grease used to lubricate the linear guides does not have a good smell. That's why I created ScentShield, a support for Arbre Magique (Air freshener) to be installed inside the printer. Thanks to the combination of ScentShield and Arbre Magique, bad odors are covered by pleasant fragrances. ScentShield is easy to print and applies easily to the printer.
Video tutorial and STL files in the description.