The heatbed of the Bambu Lab A1 is calibrated before leaving the factory. Once you have followed the instructions in the Quick Start guide, you can start printing directly. However, in cases where the heatbed is affected during transportation, resulting in auto-leveling failure, or if the heatbed needs to be disassembled or replaced for maintenance purposes, it is important to ensure that the heatbed is flat using the bed tramming method.
Before starting the bed tramming procedure, it's important to prepare the printer.
1. Remove the hotend sock and ensure that the nozzle is clean and free from any filament on the tip. If needed, heat up the nozzle and wipe the nozzle to ensure it is clean;
2. Make sure the 2 heatbed locking screws under the heatbed are fully loosened；
3. Remove the build plate and clean the surface of the heatbed, then tighten the 3 heatbed leveling screws until the bottom end of the screws sit flush with the bottom bracket. (You can feel the position with your fingers)
To begin the bed leveling process, first, download the attached g-code file, transfer it to a MicroSD Card, and then power on the printer.
After the printer completes the startup and can successfully identify the file, select the above Gcode file and click to run it, just like you would start a new print.
Please note that A1 SD card is not hot-swappable. Please turn off the power before inserting or removing the SD card to avoid any potential damage or corruption.
After the g-code file is loaded, the printer will home, then move over to the front left corner and wait for 30 seconds. When this happens, carefully turn the corresponding bed leveling screw until the printing surface barely touches the nozzle.
Reminder: Tightening the leveling screws clockwise will increase the distance between the heatbed and the nozzle; conversely, loosening the leveling screws counterclockwise will make the heatbed closer to the nozzle.
Please make sure that the nozzle is just touching the printing surface. The nozzle should not push against the printing surface, and there should be no gap between the nozzle and the bed.
When you find that the nozzle starts to actively lift, be sure to stop the leveling action and remove the hex key because the tool head will start to move.
After 30 seconds, the nozzle will move to the front right corner of the heatbed. Repeat the procedure until the nozzle barely touches the bed. The same will happen on the left rear part of the bed.
When the first leveling is done, the process will be repeated two more times, to allow you to fine-tune the adjustment and double-check the distance between the nozzle and the bed. The entire Gcode running time is about 8 minutes.
Now please tighten the 2 screws that lock the heatbed. The A1 Bed Tramming is completed.