Ultimaker 6.35mm (0.25") Bowden Tube Pneumatic Fitting and Coupler Adapter for DDG/DDE style Dual Gear Extruders
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Allows a Ultimaker 6.35mm tube and coupler to be used in a dual gear extruder that is made for 4mm OD tubes with 2mm ID.
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This is a drop in adapter to allow using the stock Ultimaker bowden tube diameter with most dual gear extruder models. The dual gear extruder is an upgrade to the single gear extruder that comes with the Ultimaker and can help with flexible filament printing.
I used this in my DXU upgrade and 1.75mm conversion https://github.com/ansonl/DXU.
It's best to print this in PETG/PC or other high temp, slightly flexible filament.
One end fits into the larger ual gear extruder opening which normally holds a metal ring and 4mm OD pneumatic fitting. Put the Ultimaker coupler/pneumatic fitting and 6.35mm bowden tube into the other end and use the printer as usal.
I created a couple of different lengths of the adapter because Ultimaker printers have the extruder mounting point at different heights on the back. I had shorter bowden tubes that had 6.35 OD and 2mm ID so I needed the longer 140mm version of the adapter to decrease the distance between the printhead and tube to reduce strain and bending.
The dual gear extruder mounting holes are aligned with the NEMA motor holes in the Ultimaker case so you just need to buy some extra long M3 bolts to pass all the way through the extruder -> case -> motor.
If you need another height, leave a comment.
9/5/25 - I uploaded the freecad project file for this before I lose it so you can modify the spreadsheet parameter for whatever height you need!