Ben Jackson's Top Guide was an essential addition to my Accessible Wade's Extruder as the filament kept falling off the hobbed bolt when it was tugged to one side. His Top Guide ensures that no matter what the angle of the incoming filament, it remains vertically centered above the hobbled bolt before it enters the extruder.
My (extremely) minor improvement is the addition of a locking clip that holds it in place when screwed in. The original top guide tends to flip along the axis of the bolt a bit as it is only held in place on one side, and if it moves, it defeats the purpose of the item.
There's one STL for the larger 3mm filament and the smaller 1.75mm filament. The larger one is probably fine for both uses, but they're both there just in case.
Print, apply pressure in the direction of the gear while inserting bolt, thread filament through hole.
The inserted bolt applies pressure against the clip preventing the top guide from lifting up during the filament feed.