Z1 Drops after print
Hello I have the problem that my print bed sinks at the rear end (z1) after a print or after “save config”. It seems as if the weight of the bed itself is causing this.
Is there anything that can be done?
52 Replies
lube the leadscrews
They are lubed pretty good. I also don't understand how lube is supposed to help here, less friction should favor the whole thing. Or am i completely wrong?
Im using liquid moly silicon grease.
sorry, posted in the wron gthread
check your motor cable crimps and the read z-motor coupler
The cables are supplied by RR. But ill check. Would the motor work at all with faulty cables?i t works perfectly until the print is finished or when you press “save config”
motors still can work if the cables are not perfect
but normaly in a turned of state they should still provide some kind of friciton
unideal wiring can cause such issues
ok good to know, will check for sure 😉
checked the wires, both ends look perfectly fine imo.
i screwed Z1 back to "normal height" and gave it a light touch with my finger:
weird, normaly the coils inside the motor do provide enoigh friction to hold the bed
thats definilty not normal
@miklschmidt any idea?
and you really checked the rear z-motor coupler?
what to check?
if the screws are tight?
if the coupler sits really tight on the motor shaft and on the leadscrew
i can check this too but i doubt thats the problem... as i said everything is fine... i can move Z up and down full speed without problems, its prints fine and everything is absolutly fine untill the print finishes or i press save config
is there a console command to just move Z1 up ? im rly tired of wheeling it up by hand 😛
im out of ideas
maybe a borken motor or stepper driver
can you try to swap the stepper driver?
yep
gimme a min
so put the rear driver to one of the front motors for example
swaped 2 steppers
visual check of both seems fine
but nothing changed
its still only on the back?
Screwing it up by hand, and yeah as soon as i put my hand off the coupler this happens.
i know this is difficult, but can you swap the steppers
:kekw:
i did
i mean the stepper motors
yeah i could.... its a nightmare on a 500... but i dont have a spare motor
put the rear motor to the front
to rule a broken motor out
if it hapens only in the back and you swap the motors, then it shoul dhappen on the front where you swapped the motor
i know its anoying, but you need to figure out what the issue is
Front motors should have to hold only 25% of the bedweight while the back one takes 50%
yes, but it should still not happen
so there is something fishy
not sure ... but ill try... just not now... ill have to figure out how to lift that damn printer 😄
@Helge Keck i have now changed 2 motors, the problem has improved somewhat, but sadly has not disappeared completely.
however, i have seen that some oil (i initially treated the threaded rods with fine oil) has run down and could possibly have crept into the motor. This may be the reason for the reduced resistance.
hmm, @miklschmidt is this possible?
user has one motor that cant hold the bed when the motors are turned off
we already checked motor couplers
No, it's magnetism
maybe the POM nut has very loose tolerances
afaik user has swapped the motors to the issue follows the motor
I'm not seeing any indication of that in this thread?
@Dayum did you tried to swap the motors as discussed?
https://discord.com/channels/582187371529764864/1316413138324688926/1316736990544265287
https://discord.com/channels/582187371529764864/1316413138324688926/1319635243392700416
"improved somewhat, but has not disappeared"
yeah, would be good to know if it still happens only in the rear with the other motor
yeah as i wrote today, i swaped 2 motors
front right and back
and where did the be moved down, at the same motor as before?
goal was to rule a broken motor out
not the same motor as before but same possition
so i the rear?
yeap
then its probably what mikl said. could be the oldham
oh man this printer is becoming more and more of a nightmare.
im sorry, this is just how debugging errors works
first you need to identify what the root cause is, then we can fix it
printed parts were horrible, broken heatbed (thermal fuse tripped at 80c), printbed with S curve in it and now this. RR should rly improve in QC
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it prints great, when it prints xD
printed parts were horriblethis can also be your filament profile settings and/or some wrong assembly
broken heatbed (thermal fuse tripped at 80c)this sucks
printbed with S curve in itthis can also be a bowed gantry caused by multiple reasons and can be fixed and/or limited
RR should rly improve in QCRR cant test every single piece they ship. they do order these parts in other factories with their own QC
the printed parts delivered by RR
i swaped the gantry to Titan tube
and checking their own printed parts and check if the printbad is somewhere flat shouldnt be impossible
you can always ratrig at [email protected] if you have any problems
yeah but i cant wait days/weeks for answers and replacements
that thing has to work
about the print quality of their parts. if you run a print farm you have other consideratons than a perfectly looking outer perimeter. they need to be functional and easy printable
look at prusas printed parts, they are all full of ringining for the same reasons
yeah but i had delamination in liek 20% of the parts
when i tried to screw into them they fall apart
ok, thats not good, but as i said contact ratirg and they handle this
so ill try to change the oldham... but thats will take a while