ROBO 3D R1+ - no screw fan duct for Stock Hot End

this is a remix (and combined with a couple other designs) .. for the ROBO 3D R1+ with the stock All Metal Hot End.

Everyone seemed to be going to the E3D v6 - but my stock all metal hot end is doing a great job. But it's shorter than the E3D v6 - hence the need for a modification.

Depending on how your printer handles bridges - print as oriented, or lay on side.

Mirror to change the side your fans will load.

Use same file for front and back.