Stop disconnecting PTFE tubes just to switch which port you’re feeding!
This compact 1-to-3 PTFE switch lets you route a single external filament source to the left, right, or TPU port on your Bambu printer—no tube swapping required. Add in one of the million 2-into-1 splitters out there, you can have a full-fledged system where you won't need to ever swap a PTFE tube again!
Boost MeStop swapping PTFE tubes for your filament changes! If this made your life easier, boost it so others can find it too. After all, every boost helps push practical designs like this forward and keeps me focused on the functional things!
This has been a HUGE pain for me as a number of the engineering filaments I print require either the left input, or right… and of course, every once and awhile needing to print TPU as well! This solves the problem once and for all!
Stop switching tubes!
What this does
Takes 1 external filament input
Lets you easily switch between 3 output paths:
Left port
Right port
Rear / TPU port
Positive feeling with magnetic positioning.
No unplugging. No re-routing. No hassle.
Why it’s useful
Quickly adapt to different material requirements
Keep your PTFE routing clean and fixed
Reduce wear on connectors from repeated swapping
Make external spool workflows actually convenient
Couple this with 2-in-1 splitters, you can have your AMSes and external spool connectors permanently fixed! No fussing around!
Important Note (for AMS users)
This model is focused on output selection (which port you feed) — not input merging.
If you want to combine AMS + external inputs, you’ll still want to use 2-to-1 joiners upstream. This switch then gives you clean control over where that filament goes.
Real-World Use Cases
Switching between CF or GF filaments (left/right) and TPU (rear) without touching tubes
Running specialty filaments that only behave well on a specific port
Keeping a permanent external spool setup without constant reconfiguration
Parts needed
(1) M3x15 hex head screw
(1) M3x4 heat insert
(6) 8mm x 3mm magnets
(4) PC4-M10 PTFE fitting connectors
Assembly Instructions
Recommended assembly tools: Needle nose pliers, a clamp, heat insert tool
Print all of the components. You will have the following:
Input Selector (1 port)
Spacer Shim
Output Selector (3 ports)
Insert the M3 heat insert into the Output Selector. Carefully trim any excess plastic that pushes upwards with a utility knife.
Insert the 3 magnets one at a time on the Output Selector. Ensure that their polarization is all in the same orientation!!!! A clamp works wonders here to squeeze the magnets into the body. Do not use any glue!
Stack one extra magnet on top of the ones just inserted on the Output Selector.
Place the Input Selector on top of the Output Selector and align the magnet holes. Squeeze the two parts together enough to get the magnets to partially embed into the Input Selector.
Separate the Input and Output Selector and then finish pressing the magnets into the Input Selector. Be careful of the tiny raised nubs. You should have something that looks like this:
Place the Spacer Shim on the Input Selector. There is an indicating mark that goes in between the two raised nubs.
Insert the M3 screw through the Input Selector and thread it through the Spacer Shim.
Bring the Input and Output Selectors together and thread the screw into the Output Selector. Do not overtighten! You want it to have enough resistance that doesn't allow the part to flop around, but still slide easily.
Insert the PC10 fittings on both the Input and Output Selectors.
Carefully look through the fittings to make sure that there are no obstructions and the print was successful. You might need to chase the holes with a 3/32" drill bit to make sure the opening are free of filament. Rotate the assembly through all 3 positions to make sure it's free and clear.
MrFunctionalPrint
