I’ve been using the H2D for months, and every time there’s a power outage, it shifts on the X-axis. While I’ve never had this problem with my P1 printers, it happens every time with the H2D. Is this just my issue, or has anyone else experienced this?
Auto recovery after a power outage is always sensitive to motions after the power is cut. Though the PSU can shortly supply some power after the outage, when the tool head is still moving at high speed, it may miss the last bit.
It is an option to not fully lose your print job, but quality can never be guaranteed. However, if you have frequent power outages, I would consider a UPS for the printer.
It also depends on how long your power outages are. Long outages require a large UPS.
Unless the H2D has battery backed-up ram, isn’t enabling power recovery always going to burn out something, either the EMMC or in the case of a P1 the SD card? I always disable it.
Modern storage is quite good, you can pull the power on a computer and everything’s fine - though you should not, as it might be writing a file as you do it, resulting in file corruption.
However if the OS is designed to handle that (e.g. it implements some kind of transactional system for writes) it should be fine and you will lose data but not system integrity.
I was referring to wear, not integrity.
I’m not sure what you’re describing.
Imagine you are reading a book to a child who gets upset if you read the story out of order. And imagine also that you know that occasionally someone is going to sneak up in back of you and club you on the head into unconsciousness.
How would you make sure that when you wake up again, you start reading the story in the same place?
Translate that to what happens in a 3d printer that doesn’t have battery backed-up ram and eventually you can wear out the thing that is remembering the last sentence you read.
I believe Klipper supports SDI Flash (internal persistent storage) for resume on power loss but I could be wrong on that. Not sure what Bambu is using but it has some kind of persistent memory.
Good quality modern storage cards have a lot of writes. I don’t feel it’s a problem, but I could be wrong there. There’s a lot of low quality SD Cards out there.
edit As stated i would be more worried about data loss from the lower write speed than SDCard wear; we can run operating systems from SDCards. But you are correct - the machine should and does have internal memory.