AMS Lite 4.0

AMS Lite 4.0 Update - 28.05.2026

Before describing the changes introduced, it is important to highlight that the new version remains compatible with previous AMS Lite 4.0 configurations. New and old S-Blocks can be used together without any issues, allowing users to upgrade their system gradually.

The only exception concerns the roller system: the new rollers are compatible exclusively with the new S-Blocks, just as the old rollers are compatible exclusively with the old S-Blocks. All other components remain fully interchangeable and compatible across different versions.

Following testing and feedback received from the community, AMS Lite 4.0 has received the following updates:

1. Updated Roller System
New system based on 623ZZ bearings, M3 screws and integrated spacers to improve precision and reliability.

2. RFID Cable Protection
A dedicated protection for the RFID cables has been added.

3. Reinforced RFID Mounting System
The S-Blocks now include integrated M3 nut slots, increasing the strength of the RFID antenna mounting system.

4. Reduced RFID Interference
The antenna layout has been modified to improve filament recognition.

5. Motor Cable Cover
A dedicated cover has been added to protect the motor cables.

6. New Top Mount System
The Top Mount has been completely redesigned using the official Bambu Lab Z-axis reinforcement.

The new structure improves overall stability and reduces vibrations transmitted to the printer.

Tutorials, images, print profiles and documentation have been updated to reflect all changes introduced in this version.

About AMS Lite 4.0

AMS Lite 4.0 was developed to improve compatibility, modularity and ease of use compared to the original AMS Lite.

Thanks to its fully modular structure, the system can be configured, expanded and customized according to individual needs while maintaining compatibility with the Bambu Lab ecosystem.

Spool Compatibility

AMS Lite 4.0 has been designed to support virtually all 1 kg spools available on the market.

The system is compatible with both plastic and cardboard spools, including many wider spools that are normally incompatible with AMS systems (such as Amazon Basics spools).

Unlike the original AMS Lite, which relies on the spool's internal diameter through a spindle-based design, AMS Lite 4.0 uses a roller support system similar to that found in the latest-generation AMS units. This allows most spools to be used without dedicated adapters, regardless of the spool core diameter.

Modular System

AMS Lite 4.0 introduces a completely modular structure.

The following configurations are supported:

• 2 spools
• 4 spools
• 1 + 1 spools
• 2 + 2 spools

Modules can be added, removed or replaced at any time, allowing the system to adapt to different needs. The structure also supports additional external spool holders, further expanding the available configurations.

Standalone Use

The modules developed for AMS Lite 4.0 do not necessarily need to be used together with an AMS Lite.

Thanks to the modular design, they can also be used as a standalone spool management and support system.

Modular Enclosure

The enclosure consists of interchangeable panels that allow the system to be customized.

Available modules include:

• Closed panel
• Inspection window
• Hygrometer module
• Dedicated PTFE outlets
• Filament Sample Holder

Each panel can be replaced without modifying the main structure.

RFID Support

AMS Lite 4.0 maintains compatibility with the original Bambu Lab RFID system.

RFID modules can be installed or removed at any time without having to disassemble or reprint the entire structure, maintaining the same flexibility as the rest of the system.

Top Mount

The Top Mount system allows AMS Lite 4.0 to be installed above the printer, reducing the space required on the desk.

Configurations and Dimensions

For a visual reference of the available configurations, please refer to the model cover images.

Dimension Legend (W × D × H)

• W = Width
• D = Depth
• H = Height

Common Height for All Configurations

• 25 cm (without enclosure)
• 26 cm (with enclosure)

Module Dimensions

Required Original Components

AMS Lite 4.0 is designed to reuse the original AMS Lite hardware.

If you already own an AMS Lite, there is no need to purchase these components again, as they can be transferred directly to the new system.

If you do not own an AMS Lite, depending on the chosen configuration, spare part availability and prices in your region, purchasing individual components may be more cost-effective than purchasing a complete AMS Lite.

The required components are:

• Mainboard
• L Feeder Motor
• R Feeder Motor (4-motor version only)
• Power Cable
• AMS Lite Side Panels (RFID version only)

Due to the variables mentioned above, each maker is encouraged to compare both options and determine which solution is the most cost-effective for their specific situation.

Required harware

RFID System

To maintain automatic recognition of official Bambu Lab spools, AMS Lite 4.0 has been designed to accommodate the original RFID readers.

It is important to note that this procedure requires cutting and extending the original RFID cables. Since this is an irreversible modification, it may void the AMS Lite warranty.

For this reason, each maker can freely decide whether or not to use the RFID system based on their own needs. It should also be considered that RFID is not essential, as A1 and A1 Mini printers allow material selection directly from the touchscreen.

Spool Rewinding

One of the most frequently asked questions concerns automatic spool rewinding.

Unlike the original AMS Lite, AMS Lite 4.0 does not use a dedicated mechanical rewinding system.

With current Bambu Lab firmware versions, the filament is only retracted a few centimeters during filament changes. This retraction creates enough tension to naturally rewind the filament onto the spool, keeping it properly positioned without any risk of tangling or jamming.

Documentation Guide

Before assembling AMS Lite 4.0, it is recommended to review all available resources, including the description, print profiles, tutorials and notes provided with the model.

If you encounter any issues, before leaving a review or comment, please make sure that you have followed the instructions correctly and used the appropriate print profiles.

If the problem persists, please contact me privately and include photos or videos of the issue. This allows me to provide faster and more effective support than through public comments.

Print Profiles

The following print profiles are available:

AMS Lite 4.0

• AMS Lite 4.0
• Old AMS Lite 4.0
• Enclosure for AMS Lite 4.0
• Top Mount AMS Lite 4.0
• Old Top Mount AMS Lite 4.0
• External Spool Holder for AMS Lite 4.0

AMS Lite 4.0 A1 Mini

• AMS Lite 4.0 A1 Mini
• Enclosure for AMS Lite 4.0 A1 Mini

The A1 Mini version does not yet include the 28.05.2026 updates and will be updated in the future.

AMS Lite 3.0 (Legacy)

• AMS Lite 3.0
• AMS Lite 3.0 A1 Mini
• Top Mount AMS Lite 3.0

These profiles are maintained for compatibility purposes, but the use of AMS Lite 4.0 is recommended.

Available Documentation

AMS Lite 4.0 (28.05.2026 Update)

• Complete Assembly Tutorial
• Enclosure Tutorial
• Top Mount Tutorial
• Print Bed Layout Guide

Previous Versions

• AMS Lite 4.0 Tutorial (pre-28.05.2026)
• Print Bed Layout Guide (pre-28.05.2026)
• AMS Lite 3.0 Description
• AMS Lite 3.0 Tutorial
• A1 Mini Print Bed Layout Guide

Thanks

I would like to sincerely thank everyone who has supported this project throughout the years.

Every like, download, print, boost and support message has contributed to the growth of this project.

I am not always able to reply to everyone, but I read and appreciate every contribution I receive. Many of the ideas and improvements introduced over the years were born thanks to the suggestions and experiences shared by the community.

AMS Lite 2.0 was created out of a personal need. Thanks to community feedback, AMS Lite 3.0 was developed, while AMS Lite 4.0 represents the result of years of improvements, testing and collaboration.

Thank you all for your support and for helping this project grow.