¶ Phenomenon Description
- During printing, some devices may produce a “thump” or “bang” sound when the machine performs a fast Z-axis direction change or Z-hop.
- The sound usually resembles a metallic or hard component hitting the plastic base, producing a knocking noise.
¶ Why does this sound occur?
Under the current load and acceleration parameters, the Z motor generates an instantaneous reverse force during fast direction changes. This force is transmitted through the mechanical structure to the plastic base, producing a certain level of noise.
¶ Is this normal?
Yes, this behavior is normal.
This kind of “drumming” sound is generally common to some extent, and may vary between devices. Due to part tolerances and assembly differences, the final sound level may differ.
¶ Suggested Solutions and Mitigation
If the sound is not accompanied by printing abnormalities or Z-axis motion issues, it generally does not affect normal use and can be safely continued. If you want to further reduce or mitigate the sound, try the following measures:
¶ 1. Firmware Update
Please ensure the device firmware has been updated to version 1.1.0 or later.
¶ 2. Check Z Timing Belt Fixing Screws
(1) Check and confirm whether the fixing screws of the Z-axis timing belt tensioner at the bottom of the machine are properly tightened. Among them, screw No. 4 in the illustration is the main fixing screw, so focus on confirming that this screw is tightened; screw No. 3 is auxiliary.
(2) If any screws are found to be loose, tighten them; if the timing belt is found to be loose, readjust the timing belt according to the following guide.
¶ 3. Reduce Z-Axis Acceleration
It is recommended to set the Z-axis acceleration to 200 mm/s². The operation steps are as follows:
¶ Step 1: Enable Advanced Mode
On the touchscreen, go to Settings > Maintenance > Advanced Mode.
¶ Step 2: Check the machine IP in Settings > Wi-Fi, then enter the IP address in your computer browser.
¶ Step 3: In the Fluidd page, go to Configuration > printer.cfg
- Open the printer.cfg file
- Press Ctrl + F and search for SET_MAX_Z_ACCEL A=500.
- Change 500 to 200, then click Save & Restart.
¶ 4. Adjust Z-Hop Type
In Snapmaker Orca, change the Z-hop type for Extruder 1–4 from Auto to Normal.
¶ Reach out to Snapmaker Support
After following the troubleshooting steps, if you find it difficult to resolve your issue, kindly submit a support ticket through https://snapmaker.formcrafts.com/u1-troubleshooting-request and share your troubleshooting results with some pictures/videos.
Our dedicated support team will be more than willing to assist you in resolving the issue.