DotBit Dual Drive Extruder Bowden coupler
thingiverse
I've been having problems with the included Bowden fittings losing their grip on the Bowden tube. To fix this, I designed my own in Fusion 360 and they're working great for me so far. The Bowden tube screws into an internal thread, and there's a 2.8mm hole for a 3mm grub screw to provide extra strength. Just be careful not to overtighten, or it could restrict the filament path inside. UPDATE: November 10th, 2019 - I added V2 STL files that include a recess for a 4mm nut. This gives far better grip on the Bowden tube. The thread leaves 5mm of clearance above the nut. You may need to drill out the ID of the tube to allow free movement of the filament after threading through the nut. Be sure to clean out the tube afterwards, or you might push something down into the hot end and clog it.
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