This is a top loading mount for TPU filament. Some like myself have CFS mount's printer for Dual CFS systems and this has almost no room for printing from the top. This mount is designed to sit on top of the two CFS units and feed the filament in-between the narrow gap of the two. The print only requires filament and some PTFE tubing to better guide the filament down into the printer. Instructions: Review the 3mf project of the orientations of the print. Some supports are painted out, like on the spool holder or ptfe guide hole. These don't seem to be required as they print just fine without them. If printing with the provided STL's make sure to have the correct orientation of parts to reduce support material. The whole mount assembles without any addition tools they either slide on each other, screw in and snap in place. The screws for the spool holder are optional in case you want more rigidity for the mount to stay locked and secured.