Improved 4-Way Bowden Splitter with Filament Sensor

This is an updated and refined version of my 4-way Bowden splitter, originally designed for MMU systems but fully compatible with many other multi-filament printer setups.

The new, more compact design reduces the overall footprint and features optimized internal filament paths, resulting in significantly lower friction and resistance. This improves filament flow, reduces stress on extruders, and increases reliability—especially during frequent tool or filament changes.

The splitter can be mounted flexibly using zip ties, allowing easy placement wherever it best fits your setup while keeping filament routing clean and organized.

An integrated filament detection switch adds an extra layer of safety. If the filament runs out, breaks, or stops moving, the printer can pause immediately—preventing failed prints, wasted material, and unnecessary runtime. Simply fix the issue, reload filament, and continue printing.

Key improvements & features:

• More compact and space-saving design

• Lower filament resistance thanks to optimized geometry

• Supports up to 4 Bowden paths

• Integrated filament runout detection

• Flexible mounting with zip ties

• Ideal for MMU and multi-material setups

Designed for smoother filament handling, higher reliability, and a cleaner printer setup.

BOM

Tools Needed

• M4 Tap

Print Settings

• Material: ABS (other may possible)

• Layer height: 0.2mm

• Extrusion width: 0.4mm, forced

• Infill percentage: 40%

• Infill type: grid, gyroid, honeycomb, triangle, or cubic

• Wall count: 4

• Solid top/bottom layers: 5

• Supports: NONE

Assembly

 See Files > Assembly.pdf

Origin

This model is a breakout from my YAMMU project. I hope this helps you out! If you have any suggestions or improvements, I'd love to hear them to make this even better.