CORE One bowden bend - better fit
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A version of the CORE One bowden bend that more securely fits the M5-4 fitting, to better align the filament path.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Prusa Parts & Upgrades
- Licencja
- GNU General Public License v2.0
This revised bowden bend fits over the M5-4 fitting more securely, reducing the wobble and better constraining the alignment of the filament path.
Background
Ever since I assembled my CORE One kit, I've been surprised that the bowden bend isn't a better fit over the M5-4 fitting. In my case I've found that the excessive wobble of the original part doesn't always support the alignment of the PTFE tube sufficiently. The misalignment is enough to cause the occasional problem when loading filament - the filament sometimes catches on an internal lip and stops before it reaches the Nextruder filament sensor. When that happens I need to open the door and nudge the bowden bend slightly more upright to be able to push the filament through to the sensor.
Design
This model increases the length of the body that sits over the fitting, and it has a slightly reduced internal diameter. These two changes reduce the wobble significantly and ensure that the PTFE tube and the filament enter the fitting vertically every time. The changes are highlighted in red in the two model images. The last two photos in this listing are of the original part, for comparison.
Printability
The original part has an angled lower end, which I believe is to make it easier to print by reducing the overhang angle towards the top of the bend. By squaring off the end I have had to tackle the overhang in a different way, by increasing the size of the small supporting web that was at the top of the original part. This provides a constant overhang of only 37 degrees from the vertical, so it prints cleanly with a 0.2mm layer height. It also has a couple of secondary benefits: it strengthens the bowden bend and it provides a convenient edge to lose the z-seam on. In the attached STL I have turned the model by 10 degrees around the z-axis so that one edge of the web is the rearmost edge - If you print the part in the supplied orientation and set the seam position to 'rear', you should get a clean, barely visible z-seam on that edge.