Layer shift MeCreator2 March 06, 2019 01:52PM |
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Re: Layer shift MeCreator2 March 07, 2019 03:27PM |
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fumo
Ok then, I slightly reduced the extrusion multiplier, cleaned and lubricated the x and y rails, and they run much smoother now. But....
after cleaning and lubricating I watched a print of a small cylinder (12mm diameter, 15mm high). At about 11 mm height I noticed an audible "clack", and the y-axis was offset by some 12mm . So I'm still after the reason for that error!!!
Re: Layer shift MeCreator2 March 10, 2019 08:18AM |
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Re: Layer shift MeCreator2 March 18, 2019 04:52PM |
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fumo
Latest (not so good) news:
I fixed (i.e. glued) the cracks in the x-ends, did a complete alignment of rods, belts, etc. and made sure everything is running as desired. The calibration cube came out fine (it finished before a layer shift occured).
Unfortunately, the layer shifts are still there. So I sat beside the printer watching what happens. This is what I found:
At first, printing is going on as usual. After some time (maybe 3 minutes, maybe 10 minutes) the printer seems to hold on for about a second, then resumes printing with shifted y layers. To rule out any network errors, I printed from SD-card (no network, no USB connection). But the issue is still there.
My last idea (for the moment) is to increase the stepper current.
Comments are welcome!
Hermann
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Re: Layer shift MeCreator2 July 27, 2019 03:31AM |
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Re: Layer shift MeCreator2 July 27, 2019 11:23AM |
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fumo
Hi guys,
unfortunately, I could not figure our what was the cause for the blown fuse. I replaced it, and everything seemed to work fine, except that the x-motor is still running hot. So I spent a fan on it and had no further problems until today:
The extruder stepper does not move anymore. Changing the driver board (A4988, lower left position in image GT2560) made no difference, so I guess the motor is gone. Checking the motor coli resistances at the connector yields 2.2 ohms between pins 1 and 4, and the same between pins 3 and 6. The other pins seem to have no connection.
Anybody who knows the correct pin assignment for the stepper motor sold by Geeetech?
Regarding the (still unsolved) problem with the hot x-stepper, I was heavily surprised when I opened the bottom case. The x-stepper still becomes hot, but the y-driver (!) board did not look good (see image Y_Stepper_Driver) , the current sense resistors are coal black, and the capacitor next to them just blew off. Anyway, the y axis worked fine until today.
Any idea what might have happened here?