Sunlu AMS Heater - Intelligent Drying System for Multi-Material Module

The AMS Heater marks a before-and-after in 3D printing by offering a comprehensive solution for simultaneous drying and production, specially designed by SUNLU to optimize the Automatic Material System (AMS) compatible with Bambu Labs FDM printers. This component, compatible with the first-generation AMS, keeps filaments in optimal conditions without interruptions thanks to its innovative intelligent heating system that reaches 70 °C in just 20 minutes, ensuring a uniform, controlled temperature throughout the printing process.

One of the main challenges in 3D printing continues to be moisture absorption by filaments, causing warping, poor layer adhesion, and print failures. With the AMS Heater, a definitive solution is introduced: the filament remains dry and stable while printing, eliminating the need for external pre-drying and significantly reducing preparation times.

Unlike the traditional workflow, which requires prolonged pre-drying before using AMS, the AMS Heater allows you to print directly while the filament is drying, without loss of quality. Comparative tests have shown that the quality of filament pre-dried for eight hours is identical to that obtained with real-time drying using the AMS Heater, saving up to 8 hours per spool.

Efficient heat, even distribution, zero warping

Thanks to its dual air-channel design, heat is evenly distributed, preventing localized overheating that can cause deformation in sensitive materials like PLA, PETG, ABS, or Nylon. This thermal efficiency is merged with an insulation system that protects the AMS’s internal electronics, preventing hot airflow from affecting them and extending the system’s lifespan.

Multicolor expansion: more space, more possibilities

Another major advancement of the AMS Heater is its structural redesign. Unlike the original AMS’s semicircular top cover, which limited stacking and made multi-color use difficult, the AMS Heater enables a design fully compatible with printing up to 16 colors, maximizing space and allowing multicolor printing without sacrificing functionality or stability.

Full compatibility and easy upgrade

The AMS Heater integrates seamlessly with the original first-generation AMS structure, including a precise fit with the original sealing strips to maintain airtightness and avoid temperature or humidity loss. Installation is quick and practical: in just two minutes you can remove the existing cover, fit the new component, and get started.

Smart humidity control: rH Mode

The AMS Heater not only heats to dry, it does so intelligently. Its automatic humidity control system, known as rH Mode, maintains internal humidity levels between 25 % and 50 %, fully adjustable based on filament type. The default operating temperature in this mode is 55 °C, but it can be customized and saved.

Additionally, this mode operates under a continuous logic: when the work cycle ends, the device doesn’t shut off immediately. Instead, it monitors humidity levels in real time, and automatically restarts heating when the value exceeds the set threshold. This functionality ensures filaments stay stable even when not in use.

Advanced safety: triple integrated protection

In terms of safety, the AMS Heater features a software temperature control system with multiple layers of protection:

• Real-time monitoring.
• Automatic alarms if temperature thresholds are exceeded.
• Fault detection in the fan or heater.
• Automatic shut-off at the end of the programmed cycle.
• Thanks to its PTC heating technology, it adjusts thermal power according to internal conditions, reducing risks and improving energy efficiency.

Why the AMS Heater is key for 3D printing

The evolution of the 3D printing market drives the need for growing automated solutions to keep filaments dry, avoid warping, and achieve precise multicolor prints. The AMS Heater addresses these needs by offering a unique combination of intelligent drying, structural compatibility, multicolor support, automated humidity control, and advanced thermal protection.

Ideal for professionals, demanding creators, and advanced manufacturing environments, the AMS Heater is not just an upgrade: it is the new standard in efficiency, control, and 3D print quality.