How can the Bambu see, if greasing is necessary?

See this picture, the message for greasing. How does the Printer know it?

Well it could be a simple “timer” such as the service light on your car every 10,000 kms. But I believe these printers actually detects when it takes more-than-normal power to move stuff around. Although that’s not rocket science at all, it’s great that they do things like that.
Perhaps there’s both, so after printing n hours it will show that notice even though it doesn’t really detect anomality.

BTW I f*cked up once when drying filament in the printer: You are supposed to clear the bed and then confirm. I somehow misunderstood and placed the filament and its cover on the bed too early. When I clicked confirm, the poor printer tried to auto-level the bed up against the needle. So the hotend crashed hard into the drying cover. Interestingly, the printer stopped and complained about the mid-bed sensor being too unsensitive.
So why did it say that? Because it was expecting input from that center sensor but the drying cover spread the force in a 210 mm ring around it so all other sensors triggered but not the center one! Plus the printer likely also detected a power surge when trying to push the drying cover against the hotend.
In the end, no damage and some interesting knowledge :sunglasses:

The printer is loaded with “load sensors” that tell it how hard it has to push to get things to move. It also understands how much current the motors draw when moving. It uses that data to decide if it’s time to do preventative maintenance.

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Mine just popped up with that reminder today. I figured it was 90 days from when I first started it.
I only have 112 hours printing time on it.
I used Super Lube Synthetic Oil, and only a small amount on all 3 lead screws. Will I see the reminder in 3 months? I do recall seeing and performing the lead screw grease on the first day or so.

Amperage draw most likely

It’s a timer.

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Does the P1S send notifications when you need to grease too?

If you got it new actually you don’t need to, it’s just a firmware bug caused by timer. But if you have been printing a while then better safe than sorry.

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I’m still not sure if it is based on time, or resistance on the z-axis stepper motor. I have a bi-monthly routine of cleaning, calibrating, tensioning, etc. and since I started doing that, I haven’t gotten those pop-up messages anymore.