Bambu Lab receives patent for intelligent speed adjustment in FFF printing jobs

Shenzhen Tuozhu Technology Co. Ltd, the parent company of the Bambu Lab brand, has been granted a patent for an “intelligent speed-adjusting method.” The WO-2025237368-A1 patent describes a method that aims to handle speed changes during FFF printing in a more differentiated manner in order to stabilize print quality.

Speed adjustments are part of everyday life in 3D printing. Slicers limit the speed in corners, bridges, or other critical geometries to reduce failures. In addition, many devices can be switched to faster modes during printing via the control panel. However, such changes do not only affect the axes of movement. Extrusion, temperature control, and cooling can also be affected by abrupt changes, for example, when more material per unit of time has to be conveyed at higher speeds.

The patented approach therefore starts before the print job begins. The controller analyzes the submitted G-code and marks “risky” maneuvers, including first layers, overhangs, and bridges. Based on this evaluation, the system divides the print path into two categories: sensitive sections that could be more easily damaged by speed changes, and less critical segments.

During printing, the adjustment should then vary depending on the path type. When switching to a faster mode, the firmware could increase the movement speed less in sensitive areas than in non-critical sections. At the same time, accompanying parameters such as fan speed could be changed in a more targeted manner to support process stability.

Another variant provides for the G-code to contain several subfiles, each corresponding to a mode. The printer could switch between these variants while executing the job, which would “pre-cook” the preparation of the modes in advance. According to the description, the function is to be anchored in the firmware and also allow real-time switching via the control panel.