Using two extruders on a long Bowden tube one assisting the other…
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The behaviour is consistent with an intermittent connection (beware that can also blow a stepper driver).
I would replace the connection to the motor that is misbehaving with a single run of wire.
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Ok tony i will do a continuity test tonight for all wires
Also notice that when they are both connected the one with the trouble just buzzes and the other one is unaffected
If someone could send a picture of the duet with the drives numbered from above say what the stock z is numerically
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Done the continuity test and all 4 wires test fine and no weird resistance between coils so I'm kinda stumped when i get home i will upload picture of the gantry
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Perhaps one pair of wires flipped ? You said the motor moves at times…so odd. If one phase is wired backwards you can get that just buzzing sound with no movement. Actually it's more like a grinding noise most of the time.
Jeff
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A picture or sketch of your configuration would be extremely helpful, as posted above. Show interesting but can't visualize the reason for needing to layout components in the manner described. So yes, please post picture whenever possible and hopefully thereafter we'll be able to help out further.
Hoping everyone is having a nice day!
Jonathan -
How do you upload pictures on here not used to this forum format ?
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@CLA:
How do you upload pictures on here not used to this forum format ?
Try putting it on google drive or dropbox or some such, then post a link.
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excuse the untidy wires etc still plenty of messing about before tidy up
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Let me help out a bit with the images.
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Not working for me. Can't access any images.
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Yeay!!! That works.
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Huh weird, I guess google must cookie the browser or something. I linked in the images and can see them, appears nobody else can.
Jeff
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strange might be so you need to be logged in to a google account
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I think I like the creepy looking room more then the idea of a bowden tube inside the drag chains.
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OK then. You have plenty of room above the printer and the extruder seems to be mounted on the X carriage. So, if it were me, I'd simply suspend the reel of filament over the centre of the bed. Have it on a rod hanging from the ceiling if you like, or build an extension to the frame. Then you can do away with one of the extruders and all the Bowden tubes apart from a short one between the single extruder and the hot end. It may not look quite as tidy, depending on how you suspend the filament reel but it'll work a hell of a lot better.
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Reason for the current arrangement is for a heated chamber i.e. the hole thing will eventually be enclosed
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You could still make a small hole in the top, say 4mm dia to take the filament. If you heat all that filament that is in that 5 metres of Bowden tubes with your current arrangement it'll go soft(ish) and will compound your existing problems.
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its not so much heating the chamber just keeping it consistent as you can see the printer is in a small mill without heating I'm sure the idea with 1x to 2x helper extruders is sound its just this odd behaviour from the furthest will it be due to length or something like that ?
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I agree that Bowden arrangement is a challenging design for the extruders. All other printers of this type have the Bowden's going over the top, not through the drag chains.
That said, the issue with the extruder motor sounds like a wiring one because it works fine with a shorter wire. I have not tried 5m long motor wires so i am not sure, but what you describe sounds like a (potentially intermittent) fault in one of the joins or connector pins or possibly even a break within the wires. Try a new set of wires, designed for flexing, that is a single run between the board and the motors.
