thank you for the advice. i have an eccentric nut as well, so I'm excited to learn that it might help to finger my gantry a little bit. and I'll definitely make sure my next purchase is a double ender.
this post was submitted on 28 Jun 2023
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Yeah, but don't forget to level your bed before fingering the gantry, otherwise things might fall of the bed during the procedure.
The older you get, it becomes ever more important to check your nuts.
The Y axis was loose on my printer, loose enough that it kept moving (slightly) to the right while printing. Taking out the 4 screws, re-aligning the axis and tightening the screws fixed this. As well as checking your nuts, check your screws too!
This is super critical for good clean prints. At least once I month I check my belts, bolts, and get out my squares and make sure the frame is properly aligned as well. These things are CNC machines, and they require exact geometry in order to function as expected.
Ender 3 V2 here, and yeah, I've done to dual-Z axes (along with a bunch of other mods) and I agree that it does give you more stability. But it also makes the problem you found with the eccentric nuts an even bigger deal, it took me a couple of reassemblies to get all that back to where it needed to be.
I'll also take this opportunity to remind anyone that PLA printed parts will creep under pressure - any part with a screw in it will require occasional re-tightening and anything that has weight or pressure on it will slowly tend towards a permanent position where that load doesn't exist.
This is especially important to know if you make motor brackets and/or belt tensioners, as they will bend over time.
Also make sure you get the right firmware on the enders. I have an ender 5 pro and put the wrong firmware on it and the z stepper wouldn't move for like the first 5 to 7 layers, or so it seemed, leading to a lot of failures. It was confusing for a while but I finally got it figured out.