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Good day folks,

I recently had an exhibit at a local convention that I lugged my Rostock Max v2 to and from a couple times over the 2 day con. Ever since then, when starting a print, the towers would home as usual but when the printer moves the hot end straight down from home to the bed (to put down the first layer) the arms move down in jerks, like move-pause-move-pause-move, rather than the smooth motion that I am accustomed to. The move-pause pattern seems to be exactly the same each time (i.e. always 2 pauses, same distance between pauses, same duration of pauses) and each pause is only a fraction of a second long.

This is the only time that it does this and it does not appear to be interfering with the actual printing process but I'm concerned that this is happening without me making any apparent changes. The only change to my setup since the con was having to reinstall Windows & MatterControl due to an HDD failure. That said, it still happens even with pre-reinstall g-code files that I had on my SDCard.

Could anyone shed any light on why this might be happening and if I should be concerned?

If you are running the stock power supply, it could be possible that you have a unit like mine where some of the 12V wires go to a separate smaller rail within the Power Supply Unit, even though it is supposed to be a single rail power supply.

If this is the case and this secondary rail is beginning to die, it could be that your power supply is stuttering at the sudden draw of current to all three steppers, but then evens off as current continues to be applied.

I seem to recall having this issue with my printer at one point, but I also believe it was before I replaced my power supply with a new Corsair one.

Here is a link to the thread where I had issues with the Power Supply. LINK