possible Z stepper issue?

I just want to rule out I'm not doing something stupid with my config that could lead to anything that would induce the issues seen in my other post. https://discord.com/channels/582187371529764864/1201626937748111512
32 Replies
blacksmithforlife
blacksmithforlife•9mo ago
Hard to tell from the klipper log. Can you attach your printer.cfg?
Lemcott
Lemcott•9mo ago
blacksmithforlife
blacksmithforlife•9mo ago
You redefined a lot of stuff, why?
Lemcott
Lemcott•9mo ago
because I originally had dual hotends set up on the one toolhead
miklschmidt
miklschmidt•9mo ago
Are you using TR8*2 lead screws?
Lemcott
Lemcott•9mo ago
I am
miklschmidt
miklschmidt•9mo ago
I've never heard anyone have good results with those, but of course i can't say that's what's causing your problems. You definitely don't want 8*8's though, they will spin from the weight of the bed when power is off.
blacksmithforlife
blacksmithforlife•9mo ago
I have tr8*2 and don't have issues, but I also use ventermechs so I'm not a typical setup I would start from a normal template and then only modify it as much as you need to get it working. But, I don't think it's software related to be honest.
Lemcott
Lemcott•9mo ago
yeah I didn't have many choices when originally putting this thing together so I had to go with tr8*2 - I don't think switching to x8 will 'solve' the issue but it should spread the issue out enough where it might be less noticeable where I can yknow... actually start to use this thing. I'm all out of ideas, which is why I was kinda hopeful I might have just been doing something dumb in the config. I appreciate the look into it.
miklschmidt
miklschmidt•9mo ago
Just to rule it out, did you try a print without heating the bed?
Lemcott
Lemcott•9mo ago
Yep I'm looking into strapping an adxl on to each arm and seeing if I can record anything odd
miklschmidt
miklschmidt•9mo ago
worth a shot
Lemcott
Lemcott•9mo ago
Keep em coming, I'll take anything at this point :pepe_sad:
miklschmidt
miklschmidt•9mo ago
I'm guessing you've already tried swapping the leadscrew nuts, right?
Lemcott
Lemcott•9mo ago
I've rotated them, no change. I'm getting tr8x8s in this week too
miklschmidt
miklschmidt•9mo ago
rotated them?
Lemcott
Lemcott•9mo ago
Like z0 to z1, z1 to z2, etc
miklschmidt
miklschmidt•9mo ago
you mean like swapped them between the other leadscrews? Maybe they're just terrible and you need new ones. I guess the TR8*8's will rule that out. right, gotcha If you turn the Z's manually (for example by rotation the couplers by hand) can you feel the force required change at an interval?
Lemcott
Lemcott•9mo ago
Nope, spins and feels like any other stepper
miklschmidt
miklschmidt•9mo ago
man that's weird af
Lemcott
Lemcott•9mo ago
I have a set of three .9deg motors I've been thinking about swapping to just because I haven't swapped two of the three motors yet
miklschmidt
miklschmidt•9mo ago
sure why not
blacksmithforlife
blacksmithforlife•9mo ago
Looking at this again, you have the run current as 1.1 which is the uncooled version. Have you tried the cooled driver version (1.6 run current)?
Lemcott
Lemcott•9mo ago
these are not the standard LDO motors, but are close enough once I lower the current I did run them at both cooled and uncooled default settings, but lowered the current simply because the motors would whiiiiiine that high.
blacksmithforlife
blacksmithforlife•9mo ago
I recall the back Z motor needed higher run current because the load is all on one motor instead shared with two motors like it is in the front. You could try increasing it just for Z1 and see if that affects the print
blacksmithforlife
blacksmithforlife•9mo ago
sounds like you got it solved! Good for you on sticking with it and not just selling it
Lemcott
Lemcott•9mo ago
okay, hopefully final question... these steppers are HOT, like actually can't touch them for more than half a second hot, running at 1.6. tried running at 1.4 and it is a little better, but still dang hot. might try to go back to 1.1 now that I removed all the other stuff and see if it still has any trouble
miklschmidt
miklschmidt•8mo ago
these steppers are HOT, like actually can't touch them for more than half a second hot
So 60C. Not hot, normal 🙂 Those are 135C steppers (assuming you're talking about the 2504AC's), and that's only because of the JST connectors.
blacksmithforlife
blacksmithforlife•8mo ago
I believe he is using different steppers (self-sourced)
miklschmidt
miklschmidt•8mo ago
Fair enough, still a normal temp though! 🙂 Many folks freak out when steppers are hot to touch and forget how terrible a human finger is at acting like a thermistor 😄
Lemcott
Lemcott•8mo ago
Iunno, I used to run CPUs without coolers and could tell the difference between 60, 70, 80C, but that was a whole ago lol. If I had to guess it was closer to 70, but I suspect it's still fine. Definitely pushing the limits of nylon-cf heat creep but that was expected from the start. I might grab some sinks and fans just because
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