CR-30 One piece 5015 Fan Duct and 40mm hotend fan upgrade.

thingiverse

Two versions are attached. One for FDM printing that requires the use of M3 heatsets, and one version for resin printing with modeled threads that will need to be followed with an M3 tap. Requires two 24v 5015 blower fans and one 24v 4010 cooling fan. Top two 4010 fan holes are designed to also be used as additional mounting points to the backing plate. If you wish to use this, you'll need to mount the duct with existing two screws, then using the top two holes as a guide drill out the mounting plate with a 2.5mm bit. then tap the two holes with an M3 tap. Now drill out the holes on the fan duct to 3mm and mount using two M3x50mm bolts. If you don't wish to use the additional mounting option, just tap the two holes to M3 or don't use them.