AMS 2 Pro Rigid PTFE 180 Degree Mount

I have the BABO+DUO AMS Drawer Stacker, which is wall mounted above a H2D printer. This Stacker allows the AMS 2 Pro units to slide forward and down. Overtime the PTFE tube bend where it exits the AMS get too tight and I get feed issues. This Modification is to resolve the lack of a proper PTFE attachment to the AMS 2 Pro.

To begin you will need to remove the existing “AMS 2 Pro PTFE Tube Release Button”, refer to the Bambu wiki for instructions.

https://wiki.bambulab.com/en/ams-2-pro/maintenance/disassembly-and-assembly

 IMPORTANT - You will need to have a method of unlocking the PTFE tube from the AMS 2 Pro after this modification, so print this releasing tool first;

https://makerworld.com/en/models/735306-ams-ptfe-tube-removal-tool#profileId-667248

Building and installing the “AMS 2 Pro Rigid PTFE 180 Degree Mount”. Refer to the attached numbered pictures.

1. Print the three files needed, 3 walls, 45% infill. PETG was fine for part A and B, but I had to print the Guide Wheel from Polycarbonate to keep the tags on the wheel from cracking.
2. Clean the two small holes in part A with a 2.5mm drill bit.
3. Tap the two small holes in part A with a M3 tap.
4. Apply two part epoxy adhesive around the PTFE hole on part A.
5. Using a 4mm dowel or a section of PTFE tubing as a work aid. Assemble Parts A and B with two M3 x 20mm flat head screws. Tighten uniformly.
6. Install a 8mm long M4 heat insert with a 6mm outside diameter into part B.
7. Locate a 1-¾ OD x 1-½ ID x 1/8 thick O-ring and a M4 x 16mm button head screw. Install on the AMS, DO NOT OVER TIGHTEN THE M4 SCREW !
8. Install the PTFE tube thru the tube portion of the Guide Wheel. You may need to clean the tube end of the Guide Wheel with a 4mm drill bit. Leave a long amount of tube past the Guide Wheel end as shown. Slide the PTFE tube into the AMS 2 Pro until it bottoms and is locked in place.
9. Slide the tube end of the Guide Wheel so that it fully seats in Part A. Snap the PTFE tube into the clips around the wheel.

Shed_Engineer allowed me to modify his Guide Wheel for this project, see;

https://makerworld.com/en/models/897032-ams-to-4-way-tube-guide#profileId-855274