Using two extruders on a long Bowden tube one assisting the other…
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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.
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I just see something like PLA fracturing in that drag chain setup. It's also going to add far more friction to the equation. Sometimes you just can't get what you want.
Jeff
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@(In)Sanity:
I just see something like PLA fracturing in that drag chain setup…..........
Jeff
Absolutely. Slightly aged translucent PLA is an absolute bugger for doing that, even with my 250mm long Bowden tubes. It goes really brittle and breaks with the slightest provocation so I'd say the OP will have absolutely no chance of printing translucent PLAs. (Just my personal opinion you understand - no offence meant).
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@(In)Sanity:
I just see something like PLA fracturing in that drag chain setup…..........
Jeff
Absolutely. Slightly aged translucent PLA is an absolute bugger for doing that, even with my 250mm long Bowden tubes. It goes really brittle and breaks with the slightest provocation so I'd say the OP will have absolutely no chance of printing translucent PLAs. (Just my personal opinion you understand - no offence meant).
I would add in any aged PLA, Something that you can get away with using a direct or short bowden that would just never work with the drag chains.
Jeff
