The alignment drifts a little bit every time you do a print. Over time and many prints this ‘little bit’ accumulates into a noticeable drift. Rebooting resets everything. Here the post that dan points out the issue:
Indeed - we currently only realign the head when you power cycle the machine (or in certain other unusual situations). As a result, alignment can drift over the course of many prints if the machine isn’t occasionally rebooted. (In fact @Tony just pinged me about this). We are working hard to fix the problem to fulfill that.
And here is a post that discusses this in technical detail:
I believe this is a bug in the cloud.
After running each ‘motion’ file, the device resets its position to 0,0, and it lets the cloud keep track of where the head is located.
When you see “Scanning Material”, the device receives a ‘motion’ file from the cloud telling it where to move to so it can take the thickness measurement. After it is done, the cloud sends another ‘motion’ file to send it home*.
This is where the potential bug lies. The return motion sends it back to -1,1, instead of 0…
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