This is for mounting a J-head to a Wade's Extruder. The J-Head in the Photo is the Mk. V-b, but Any J-head will fit because it is Parametric. It Measures 70x25x8mm, so it shouldn't get in the way of your extruder gears.

Updated: I added a filling.scad and .stl, it is for the gap between the Wade's Extruder and the Hotend. This keeps the filament from getting caught up. The Mounting Plate now has Nut Traps so you can use M3 x 25, and not have any screw left on the other side.

Update 2: I added another STL file with a wireholder attached to the clamp, this is for holding the wires that run from the Hotend. I kept the STL file that doesn't have that. I also changed the OpenSCAD file, with the wireholder added. If you don't want it, just change the "wireholder=true;" to wireholder=false;"

The STL is set up for M3 Nuts and Screws, If you want to change this, use the Variables in the .Scad File, But remember to change the thickness of the overall Plate accordingly.