This is a common problem with an easy remedy. There are a couple of things about the SD card you’ll want to know.
The factory-supplied card uses the cheapest SD technology available, and based on numerous reports like yours, it clearly isn’t suited for high-use applications. Bambu’s system architecture uses the SD card for caching, which cheaper cards aren’t built to handle reliably.
All SD cards degrade over time due to their limited write endurance. Quality cards from brands like SanDisk or Samsung are engineered with better wear-leveling and internal block management. Once a memory block wears out, better cards retire that block and reallocate its address to prevent future errors. For this application, you don’t need speed—you need durability.
Remedy – Use a High Endurance SD Card
Quick Fix
Start by reformatting your existing card inside the printer. This ensures it uses FAT32, which the printer requires. Formatting on a PC is possible but less foolproof—desktop OSes may apply incompatible formats like NTFS or exFAT.
Long Term Fix
For replacement, look for a “High Endurance” SD card. These are designed for write-intensive tasks like surveillance systems where data is constantly overwritten. Avoid high-capacity or high-speed cards—they won’t help here. The Bambu firmware only supports up to 32GB, and benchmarks show the interface is slow (likely SPI), so faster cards offer no benefit.
Here’s where you can readily find such cards. Personally I stick with only Sandisk and Samsung and I would avoid PNY at all costs, I have a box of bad PNY cards. Kingston is another low cost brand. Avoid the Amazon-only brands you don’t recognize, it’s just not worth the savings.
