u/Bruteloops

I picked up a used Bambu Lab A1 with about 400 hours on it, and it prints perfectly, but it keeps failing X-axis calibration with error 0300-1000-0002-0001, saying the X-axis resonance is low and the timing belt may be loose. I've already followed Bambu's maintenance guide (loosened the screw on the back of the toolhead, moved it back and forth three times, and retightened it), but nothing changed. The only thing I've noticed compared to my brand-new A1 is that the X-axis feels noticeably tighter when I move the print head by hand with the printer powered off. The resistance is and consistent across the entire rail, no binding or rough spots. Has anyone run into this before, and if so, what ended up being the fix?

The A1 has 419 hours on it

The A1 mini has 128 hours

Practically new, I cleaned them, lubricated and calibrated. Benchys came out perfect!

I picked this up as a third printer, and it's been printing almost nonstop since I got it. It's been damn near flawless. I was expecting to make a few compromises compared to my P2S printers, but honestly I haven't found much to complain about yet.

I started printing in the ender 3 era about 7 years ago, I ran ender 3's, mk2's and ender 6 (all great btw)

I took a break for a couple years and I'm back at it, tbese machines are impressive and I'm having a blast!

Made from a custom image and then plugged into makerlab's make my statue. ( I'm not great with cad) Alot of sanding, spot putty, more sanding, primer then more sanding and finally hand painting/ airbrushing.

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I uploaded the STL to makerworld if anybody wants to give it a try!

When it starts up it displays the Lian Li logo completely normal. Bright white with a black background. Then it runs normally for a few minutes, then suddenly starts flickering/ dimming. I tried a complete power drain by unplugging the the power supply and holding the power button down for 15 seconds. It didn't work, also made sure there weren't any updates for the AIO in the Lian Li app. Any advice?