Bambu Lab Y-Splitter with PC4-M10 pneumatic connector and magnets

Update 23rd November v2.1

Added an additional model suitable for 6x2mm magnets.

Update 14th November v2.1

Added an additional model suitable for 5x2mm magnets.

Update 13th November v2.1

Added an additional model suitable for 6x3mm magnets.

Update 12th November v2.1

Added text for all 3 filament entries.

Update 12th November v2.0

As requested by a user in the Bambu Lab Facebook Group, I have added a 4th magnet and a second variant for 4mm x 4mm magnets. I have also fixed the issue with the STEP file which would cause an error message when importing into Bambu Studio.

Update 4th November v1.2

I have added v1.2 which has an ID of 2.8mm for the AMS and external spool entries and an ID of 2.45mm for the exit to the printer. This version should solve any issues for tolerance and avoid any filament snagging on the way to the toolhead. The STEP file has been updated to v1.2. Thanks again to Robu for the feedback.

Update 3rd November v1.1

The 3D model was initially designed with a filament path ID of 2.5mm. During my initial print tests (using eSun PLA+ and eSun PETG) the filament path was coming out slightly smaller than the expected diameter so to compensate I increased the ID to 2.8mm. Some users however have experienced filament snagging against the PTFE tube, as mentioned by Robu in the comments. I have therefore added an additional model v1.1, with an ID of 2.5mm. Print this update if your Slicer's filament profile is perfectly tuned.

Description

This model is loosely based on the Bambu Lab X1 Y-Splitter from kjbturok. I was initially planning to remix kjbturok's model but I had to start from scratch since I wanted to accomplish the below 3 goals:

1. Follow the filament's natural path for both AMS and external spool. The filament path in all available Y-Splitter designs is optimal only for the AMS. For the external spool, however, the splitter usually turns in an up direction, which can cause the filament to get snag when inserting it.
2. Relieve the strain on the toolhead PTFE Tube. This was achieved by adding a support section accommodating 3 neodymium magnets (5mm x 5mm). The Y-Splitter snaps nicely in place on the back cover of the printer.
3. Remove the stock coupling. I wanted to reduce the weight and length of the whole setup. Since this model has pneumatic connectors on all 3 entries, the stock one isn't really required.

I have been using this Y-Splitter for over a week and can confirm it works beautifully. The AMS colour changes work effortlessly, and I am able to start a print with the external spool in a matter of seconds.

Print Settings

• Material: PETG (optimal) - PLA (best) 
• Layer height: 0.08mm (optimal) - 0.12mm (best)
• Walls: 4 (highly recommended)
• Infill: 25%
• Infill pattern: Grid
• Enable Support: YES
• Support Type: Tree (auto)
• Support Top Z distance: 0.45mm (this setting is to allow easy removal of the support)
• Support/object XY distance: 0.5mm (this setting is to allow easy removal of the support)
• Brim Type: Auto (highly recommended)

Bill of Materials

• 3 x PC4-M10 pneumatic connector (Amazon affiliate link)
• 3 x neodymium magnets 5mm x 5mm (Amazon affiliate link)

Important

You need to adjust the toolhead PTFE tube to gain an additional 22mm so it sits flush inside the Y-Splitter. Alternatively, you can purchase a longer PTFE tube. If you decide to purchase a new one, ensure the ID is 2.5mm and the OD is 4mm.

I have moved the pneumatic stopper on the toolhead PTFE tube (the one sitting on the inside of the printer, next to the rubber sleeve where the PTFE tube exits the rear) and I can confirm that everything works perfectly fine. This option worked for me but may not for you so go print at your own risk. If you decide to go for this option, make sure the toolhead can reach the opposite corner and that the PTFE tube follows a natural path without any restrictions. 

Disclaimer

Avoid using any Carbon Fiber polymers (or any other abrasive options) to print this Y-Splitter since the roughness of the surface may cause the filament to get stuck on the inside path of the actual model.

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