1 Topic by mjsbuddha (edited by mjsbuddha 2015-08-14 21:41:46)

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Topic: Odd shifting on both x AND y axis

Does anyone know what could make this happen? I have 5 Da Vinci printers and the second one has started to shift on both the x and y axis.

It doesnt get caught and grind or anything. I watched it to make sure. Just between two layers the head will mode to a new location before starting the next layer, life thats what the gcode told it to do. Same gcode on any of my other machines works fine.

It's like the gcode is getting scrambled on the way to the printer or its being read wrong while printing. printing the demos from the SD card works just fine.

I can't think of anything that would do that other then the motherboard going bad. Any ideas?

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2 Reply by FrozenRC

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Re: Odd shifting on both x AND y axis

Mine does that every once in a while, I only have one machine and believe it might be the stepper drivers getting to hot as it has seemed to happen when I'm pushing the printer speed wise. I actually installed heat sinks on the stepper drivers today.  Only time will tell.

I'm running a 1.0 with repetier .92

3 Reply by mjsbuddha

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Re: Odd shifting on both x AND y axis

How exactly did you attach heat sinks to the stepper drivers?

4 Reply by FrozenRC

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Re: Odd shifting on both x AND y axis

Cut them to size from a scrap video card heatsink, cpu thermal compound, and a hot glue gun.

Didn't feel like buying and waiting for some thermal epoxy.

5 Reply by carl_m1968

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Re: Odd shifting on both x AND y axis

FrozenRC wrote:

Cut them to size from a scrap video card heatsink, cpu thermal compound, and a hot glue gun.

Didn't feel like buying and waiting for some thermal epoxy.

Hot glue is actually a thermal insulator rather than conductor. In essence all you have done in your haste is trap heat in the chip. You should order snd use double sided thermal tape, it is the normal method.

If your issue is not heat related then like many others you have bad motor harnesses

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

6 Reply by FrozenRC

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Re: Odd shifting on both x AND y axis

carl_m1968 wrote:

Hot glue is actually a thermal insulator rather than conductor. In essence all you have done in your haste is trap heat in the chip. You should order snd use double sided thermal tape, it is the normal method.

If your issue is not heat related then like many others you have bad motor harnesses

My haste is more thought out that you imply, which is why I didn't glob it on and it does not make contact between the chip and heatsink. the hot glue only contacts a very small portion of the edge on heatsinks, it is only there to hold the position of the heatsinks, I used cpu thermal compound between the chip and the heatsink.

I have experienced the x axis harness issue and that has been fixed.  The problem I have been having is only 1 every 20ish prints.

If you look at the OP pics, the print shifted on both x and y axis'.

7 Reply by mjsbuddha

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Re: Odd shifting on both x AND y axis

I dont see how it could be either the drivers OR the harness because, as I said. prints from the SD card work just fine. Its only when I send the gcode over usb that it screws up. I've tried different usb cords and also different computers and the same still happens so its on the printers end what ever it is.

8 Reply by FrozenRC

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Re: Odd shifting on both x AND y axis

Then I would suspect the motherboard, especially if it happens every time with any print job sent via USB.

9 Reply by carl_m1968

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Re: Odd shifting on both x AND y axis

The post seems to have vanished but it asked if you run all 5 printers from on computer at the same time? It could be a USB problem in regards to speed and data errors if you are running that many. Have you tried putting one of the other printers on that port and the bad on another port? I also assume you are using a hub which is actually said im many printer manuals to not be used. Printers should be connected directly to the PC usb port. Get 40 dollar xp laptops if you need to. A hub will just lead to errors and lost data.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

10 Reply by FrozenRC

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Re: Odd shifting on both x AND y axis

Ya I deleted the post because he indicated in a response that he had tried different computers.  However that was assuming a direct connection to the printer in question.

11 Reply by mjsbuddha

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Re: Odd shifting on both x AND y axis

yes I use a hub to connect them all to the same computer, but I have tested with just the one connected directly and the same still happens. And yes, it is every print, or at least 9 out of 10

12 Reply by carl_m1968

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Re: Odd shifting on both x AND y axis

I had the same issue but not as bad and it was a motor getting too hot. It is a known fact the stock board is over driving the motors and there is no way to adjust it due to the fact that current to the motors is under digital control by the firmware. This is further evident by the noise level of the machine. Once I corrected mine I could not hear it running while in the same room.

The fix was a complete swap out of the controller for a RAMPS 1.4 and its LCD. I gained the ability to properly adjust current and SDcard printing as well which does away with a computer and direct connections. The difference in print quality was on an entire different level as well. You don't have to take my word, there are others that have done it as well if you look around with similar results.

The fact is the way the Da Vinci is set up stock you will be replacing motors and/or stepper drivers for the life of the machine and much more often then you should.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

13 Reply by mjsbuddha

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Re: Odd shifting on both x AND y axis

carl_m1968 wrote:

I had the same issue but not as bad and it was a motor getting too hot. It is a known fact the stock board is over driving the motors and there is no way to adjust it due to the fact that current to the motors is under digital control by the firmware. This is further evident by the noise level of the machine. Once I corrected mine I could not hear it running while in the same room.

The fix was a complete swap out of the controller for a RAMPS 1.4 and its LCD. I gained the ability to properly adjust current and SDcard printing as well which does away with a computer and direct connections. The difference in print quality was on an entire different level as well. You don't have to take my word, there are others that have done it as well if you look around with similar results.

The fact is the way the Da Vinci is set up stock you will be replacing motors and/or stepper drivers for the life of the machine and much more often then you should.

How hard was the conversion?