My Creality K1 bed is actually in pretty good shape (max deviation of 0.7mm left to right, 0.1mm back to front), but I recognize that many folks might have beds that are off as much as 1.5 or more mm. The K1 has 3 lead screws, but not proper 3 point leveling (maybe someone will create a daughter board and a 3 point conversion kit in the future, after Creality open sources their firmware for the K1 series -- anyone out there that does this, I'd probably throw some small amount of money at you).
As far as I understand it, there are currently two methods to properly tram your bed:
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Follow the creality way, which is essentially immobilize the bed with shipping screws and retension the belt that synchronizes the 3 Z screws. To do this, you must turn the printer on it's side, remove the bottom panel, and fight the tensioner. Reports are mixed luck doing this.
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Skip teeth. You still have to do the bottom removal, but instead of completely removing the belt and detensioning, you slip the teeth on the belt drive (I think this is something like 0.4mm for each slipped tooth). There is less information about this, but there's a video in Chinese showing someone doing it. Perhaps a more helpful guide would democratize this more, and it might have more success than 1?
My question is: there are grub screws on the 3 lead screws, on the top side, accessible from the printer cabinet -- would it be possible to loosen the grub screws, so the z rod in that position spins freely, turn that z rod just slightly, then reseat the grub screw? That would seem a lot easier to relevel the bed, than doing either of the above procedures. Am I missing something?
Ok, I can't really confirm this for sure as these machines have to be delivered later today and I can't go taking them apart, but I took a look at our K1's and my guess is no. I think the grub screws you see in the case are for collars that keep the lead screws at the correct height, with no motor below there's nothing else to stop them moving down. To adjust the bed level you'd have to loosen off the set screws that the sync T belt uses and thats only accessible from the base.
Ah I see, thanks very much for replying with this info! That actually makes a fair bit of sense. Little bit unfortunate, as I think the bottom plate with adjustments is quite cumbersome but more importantly difficult to get correct. I may just get some foil tape to shim for now, but will keep thinking of other solutions also.
Thanks again for the response!
Yeah, its a bit of a pain if thats what it requires. Luckily none of the ones I've worked on so far have been off by more than a millimeter across the bed and thats acceptable to me (at least for where these machines are going) for bed leveling to do the rest so I havent opened up the bottom on any yet. Solid machines printing wise though! Been incredibly impressed so far despite hit or miss reviews online, only failed prints I've had are from met arranging models poorly. And no worries, best of luck with the machine!