Re: SOLVED Stepper motor too slow
@didzix how did you set 1/16 micro stepping on ramps ? will you please explain ? and does microstepping decreases layer height ? any help appreciated !! thanks
View ArticleRe: Micro Stepping Issue
QuoteDr. Bogger They are set to 1/16 Micro Stepping Mode, however, I get the same issue in 1/4 and 1/8 mode. how to set 1/16 micro stepping mode ? please help !!
View ArticleRe: :SStepper Motors:)-D:)-D
Jumpers See: [reprap.org] They are under the plugin driver boards! :S
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Re: Micro Stepping Issue
You set the jumpers under the polulu modules, most boards this is jumpers, some boards this is software... depends on what board you have. Eg for ramps see the colored jumpers below Set as desired...
View ArticleVery jerky stepper movement
Hi all, My Printer: 'Official' Prusa i3 Mini-Rambo E3D V6 hotend Running Octoprint on a Pi You've solved many of my problems without me having to start a topic but I need a little advice with my...
View ArticleRe: Very jerky stepper movement
Probably the driver has failed. Or you have a bad connection at one end of the stepper motor cable.
View ArticleServo won't move with M280 GCode commands
Hello everyone, This is my first post to the Reprap Forum so please excuse me if I am adding this to the wrong folder or if there is a solution already posted, however I have looked for hours and...
View ArticleRe: Very jerky stepper movement
Thanks dc42, It must be the former as swapping the steppers transfers the issue. I feared it was the Rambo, has anyone had any success with replacing the driver chips? I'm confident of getting a new...
View ArticleRe: Very jerky stepper movement
What about microstepping jumpers? Are there any on the MiniRumba? Maybe they lost contact and now the stepper runs full-step mode? -Olaf
View ArticleRe: Very jerky stepper movement
Hi Olaf, There is nothing to tweak on the (Mini)Rambo, no jumpers, nothing. :( See this photo. I doubt it's the micro-stepping but can't say for certain, I would expect much less noise and vibration...
View ArticleRe: Very jerky stepper movement
Before desoldering the driver, I would check the output pins for cold solder joints or broken traces. With a hotair gun, you can easily blow away all the surrounding smd parts. Maybe you have better...
View ArticleRe: Very jerky stepper movement
Thanks for the tip. As I say, I haven't had much experience with desoldering SMD but my current plan is to use some gaffer tape to protect the surrounding parts. I am thinking about using a few layers...
View ArticleRe: Very jerky stepper movement
Before you try to remove the chip, check the cable - or perhaps you swapped the X and Y motor connections at the electronics end already, so you know the cable is OK. Also check the board for bad...
View ArticleRe: Very jerky stepper movement
Good advice. I have checked the cables by swapping the steppers at the board end but haven't checked for dry joints yet. I will do so before I attempt anything drastic. I've used Pololu A4988 boards...
View ArticleRe: Very jerky stepper movement
If the board is only 3 weeks old then I suggest you ask for a replacement under warranty. These driver chips are designed to be cooled through the PCB, so all-in-one boards usually cool them much...
View ArticleRe: Very jerky stepper movement
Thanks David (just found out who you are!), Given what you said about bad mounting position, the board on the Prusa is fine (just mounted vertically on the frame behind the X stepper). Good points...
View ArticleRe: Very jerky stepper movement
QuoteJelby-John Bad connection along the cable is very unlikely given that it affects a stepper which doesn't move at all (and has a short, straight cable run). It doesn't matter whether the motor...
View ArticleRe: Very jerky stepper movement
David, Fair points but that leaves me in a bind inasmuch as if I try swapping the X & Y over (as I have done before), if there is a bad connection along the Y stepper cable, I risk damaging the X...
View ArticleRe: Very jerky stepper movement
John, it sounds to me that you have done the right things to eliminate the possibility of a bad cable or motor. So I guess it was either infant mortality of the chip, or the chips are running too hot...
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