I update, revise and improve my design for my fixes very often. Please only use my Print Profile (Labelled as Designer or SPStudio) to ensure this fix is updated & work well. Profile with Non-Designer tags may be of poor functionality or non updated model.

Click on Like if this model helped you in some way. It is very important and will help increase the exposure of this design to more people who might need it. Cheers!

This is an experimental fix, although it have been tested more than 90k times in total, effectiveness will varies. Please use new V2 version of this fix for increased effectiveness.

I do advise you try all my other Ams fixes, if those still doesn't solve your problem then you can try out this fix as an last resort. Most people got their problem solved even before requiring this fix. You can easily find the rest of my Ams fixes by clicking on my Profile then go to the Collection tab.

Announcement 23 Dec 542am SGT.
V2 for the extruder fix is finally here. It is meant to replace this V1.

I would suggest you try out V2 first and if it doesn't work well for you then try this V1.

Total retraction tests on 7 machines counted at about 15500 retractions tested, not including the 9 beta testers that helped out. I do think that V2 should be mre reliable and works betta than V1. Please let me know if you encounter any problems.

Read about the improvements and changes and get V2 here. https://makerworld.com/en/models/103987

Announcement
New and Improved V2 Versions for the Ams Buffer Fix Before Buffer and After Buffer have just been released. Do check them out in my profile to see what are the improvement. Thank you for your continuous support.

Update 28 Nov 11pm SGT:

Choose Extended version - if you are using any riser or your tp glass is not directly resting on the frame of the printer

Choose Shorter version - if your tp Glass is directly on the frame of the printer with no riser or anything in between the glass and the Frame of the printer.

The Extended height of the fix is used to compensate for people who is using a riser or anything in between the glass and the frame.

Introduction

Failed to pull back filament error can be caused by multiple different variables & factors. This is a part of an series of Ams fixes that i have designed which can complement each other when used together. I do suggest you install all my fixes together for the 0ptimal effect to help your filament travel properly across the entire system which in turn can help improve, reduce or remove any potential Ams errors.

I have grouped all fixes into their respective Collection for ease of searching what to install.

V2 Collection are improvements done on the shortcoming of V1 Collection. Feel free to try V2 Collection and if it doesn't work properly then you can try the V1 Collection. You can easily find each of the Collection by clicking on the Collections tab on my profile.

Unfortunately there isn't a single fix that can 100% work for everyone. What works for others, may not work for you but my fixes is definately a great place to start and have worked for majority of the users. My fixes are precisely measured then modelled. A Proper Fix would have the highest chance to reduce or solve the error.

If you are too bored to read the entire lengthy write up explaining the need for this fix, here is the TL:DR.

What is this?
Extruder Ams Filament Pull Back Fix will correct and maintain a nearly 100% straight line to move the filament in and out of the extruder. This will also reducing wear on the Ptfe tube. Its design allow the filament to travel in the most smooth, least amount of friction and pressure for the proper angle to go into and exit the extruder thus greatly reducing the possibility of an Failed To Retract Filament error or similar errors from popping up.

Who needs this fix?
I believe that anyone With or Without a Ams or even a modded Hydra Ams would benefit from this fix / enhancement regardless of do you have any problem or errors with the Ams / Printer or you do side or back spool loading.

Have this fix been tested?

This fix have been tested for on 1 X1C, 1 P1P and 2 P1S for about 96500 retractions so far as of this listing.

Why choose this fix?

ez to print
Dimensionally accurate to allow the Ptfe to be straight at the extruder part
Tested and measured to get the most optimal height and size to be fitted on the extruder plate yet light enough to prevents any problems that might negatively affect the movement of the Print Head.
Well Supported as its designed to be fixed with the original screws, not free floating thus removing any possibility of the Ptfe tube misaligning during movement.
Compatible with all Bambu Printers
Compatible with riser or non riser users it will work for any and all
Unlike the common similar fixes, this fix is designed to avoid rotating with the Ptfe tube changing directions when the print head moves, when there is movement and rotation then chances of misalignment may follows. This fix is fixated on the print head itself, no matter how the Ptfe tube move it will not affected the alignment of the inwards angle of the Ptfe tube so it stays straight.

This can and will allow the filament go into and exit the extruder with a smooth movement with the least amount of friction.

Which to choose?

If you print mainly Abs / Asa or other high temp material, please choose the ABS / ASA Print Profile

If you print mainly Pla / Petg, then the Petg Print Profile will work fine.

Abs / Asa can wrap during printing. Glue stick would help. Please ensure your print of the fix is flat at the base before install.

PETG will not be affected.

Installation Video

Set the fix in place lightly first then align and adjust it to sit in the groove at the back plate. Notice how the fix just resting on tp of the Ptfe connector. Then slowly screw back the screws in a left right rotation motion till you feel some tension then stop.

The fix should not move up and down freely. The install video will show you the proper tightness of the fix.

Do not jam in the screws all the way or screw it in too tightly. Its unnecessary.

There must be a very small gap in between the fix and the Ptfe Connector Head.

Do not press the fix down pressing the Ptfe Connector Head down then screw in. Please do not do that.

Just lightly rest the fix on tp of the Ptfe Connector Head , there are groove behind the fix that will match the rear plate, just sit it in and screw in lightly left right rotation, That's all.

Important. It should not be too tight or too loose. Follow this video for just right amount of movement.

Important Notes:

Note 1: This is compatible with any P1P P1S X1C with or without Ams.

Note 2: Please follow the instructional video carefully its very important.

Note 3: Hydra or Non Modified Ams can all benefit from this fix.

Note 4: Please do NOT overtighten the screws. Just finger tight then go back 1 full round. That would be just enough.

Note 5: Align the fix then lightly screw in one screw follow by the next then slowly screw both screws in bit by bit turn by turn. Do not screw in either side fully then the other side fully. This is wrong.

Note 6: You need to ensure there is a gap between the fix and the Extruder Head. Its a must. Scroll down for details

Note 7: Do ensure the Ptfe is inserted all the way into the extruder after you installed the fix.

Note 8: Please check and follow installation video below.

What Mod / Fixes / Enhancement do i offer?

Please don't download the wrong one. Only those in the photos below is designed by me who painstakingly took a lot of time to measure carefully and design just to get it working. #SupportOriginal Love you guys for all the support so far!

- Ams FIX Failed To Retract Filament Error (a preventive measure and solve the bay 2 and 3 error and prevent bay 1 and 4 to have any possibility of having an error due to tension and friction) (Updated design on the 2nd photo below, try 1 then if it doesn't works properly for you then install the other one.)

(BRAND NEW) Ams Filament Pull Back Fix V2 Upgraded - Completely New Design Upgrade For Ams Filament Pull Back ERROR! Precisely Measured

- Ams Buffer Fix For Failed To Pull Back Filament Error (reduce wear on the external Ptfe tube and allow the most smooth, least friction angle to go into the Ams buffer thus reducing the possibility of an error popping up)

- V2 Ams Buffer Fix For Failed To Pull Back Filament Error (reduce wear on the external Ptfe tube and allow the most smooth, least friction angle to go into the Ams buffer thus reducing the possibility of an error popping up)

- Ams Fix - Stack the Ams on tp (Using a carefully measured holder to hold the Ptfe in a curved angle that will allow filament to go through with the least possible amount of friction when the Ams is stacked on tp of the printer)

- Ams Buffer Ptfe Right Guide Mount Fix will correct and maintain a nearly 100% straight line when the Ptfe tube exit the Ams buffer to move into the printer extruder.

- V2 Ams Buffer Right Ptfe Guide Mount - The Fix For Failed To Pull Back Filament a newly improved fix designed to replaced the V1 This will correct and maintain a nearly 100% straight line when the Ptfe tube exit the Ams buffer to move into the printer extruder. ez Installation. No screws needed!

- Extruder Ams Filament Pull Back Fix will correct and maintain a nearly 100% straight line to move the filament in and out of the extruder. This will also reducing wear on the Ptfe tube. Its design allow the filament to travel in the most smooth, least amount of friction and pressure for the proper angle to go into and exit the extruder thus greatly reducing the possibility of an Failed To Retract Filament error or similar errors from popping up.

- V2 Extruder Ams Filament Pull Back Fix will correct and maintain a nearly 100% straight line to move the filament in and out of the extruder. This will also reducing wear on the Ptfe tube. Its design allow the filament to travel in the most smooth, least amount of friction and pressure for the proper angle to go into and exit the extruder thus greatly reducing the possibility of an Failed To Retract Filament error or similar errors from popping up.

- The Smooth 4 Way Splitter. Look No Further. Combined with Ams Hub Lite together with this small attachment, you will have the Smooth 4 Way Splitter.

Technical Write Up

Friction - The cause of most of the Ams filament failed to retract problem.

As shown in the following photo, the Ptfe tube that go into the extruder may and is often bent in an angle. It creates bends or pressure on the shape of the Ptfe tube in turn creates a lot of friction, as the Printer and Ams is equipped with multiple sensors, these friction will cause filament not passing through the Ams to the printer smoothly and thus causing the Ams Failed To Retract Filament Error and similarly related errors.

So what is the possible solution to the problem?
Firstly we need to reduce friction for filament passing through Ptfe tubes? Simple! If we optimise the angle of the Ptfe it will allow the filament to enter and exit the Extruder with the least amount of friction and pressure.

So what i have created to solve the problem?
I have made a fix that will extend and hold the Ptfe in place at the extruder for a proper exit angle when filament is push or pull out of the extruder.

What do i need in additional to installing this printed fix part?
Nothing, just remove the screws from the extruder plate and install the new upgraded fix that's all. See the installation video for info.

Removal Video:

Loosen the 2 screws just enough for the fix to wobble then press down and release the Ptfe tube the remove the fix.

Additional Notes

The error itself is complicated and non definitive. Whatever cause the error today might not be the same area that cause the error again, same with person A and Person B setup, as the error itself is mainly due to tension with friction triggering the sensors in the machine.

I would suggest you download and try and install all my fixes together for the proper effect as together they will ensure a smooth delivery of the filament with much lesser friction (read write ups) and hopefully that will help and reduce or resolve the error. If you use only one or 2 of the fixes the error could still happen as there are still other area might still be causing excessive friction.

Bambu P1S Tuning