This is a mount for attaching two E3D hot-ends to a Rostock MAX under the platform carriage. I assume it will work for an Orion as well.

Print the 3 parts in ABS. I used four 3" #6-32 screws to attach but I believe 2.5" screws will work as well. I also used the fan from one of the E3D hot-ends and temperatures seem fine where I tested them with both hot-ends at ~240C.

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E3D, Dual