This is a mod to the original D-Bot extruder backplate by spauda1
https://www.thingiverse.com/thing:1001065

The original design worked fine for me but I found that the gap between the extruder gear and the filament feed hole occasionally allowed the filament to spill out of the gap and create a birds nest.

I've recreated the extruder and moved the entrance to the filament feed much closer to the extruder hob gear, I've been using this modded part for a few weeks now and the problem has pretty much gone away.

.step file included