Multi-material filament feeder/repurpose E1 stepper driver
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Ok, thanks.
Where does the jam occur? Between the loader and the carriage?
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@fma In occurs when loading the filament back in when right as the filament enters the nozzle. Some filaments, the breakaway in particular, have a slight bulge at the tip after unloading.
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@red-sand-robot A supper rough BOM is now on our Thingiverse page along with updated files https://www.thingiverse.com/thing:2992637
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did the knife improve reliability? ive seen the prusa mmu2 struggle with the E3d breakaway also in videos
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@gavatron3000 I have not tested the e3d breakaway since adding the cutting mechanism. I have had it up and running with the blade for a day and a half now. So far reliability is much better. I will let you know how the breakaway supports go once I have tested them.
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Where did you put the cutter? On the loader carriage, as Prusa did?
Frédéric
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@fma Yes, it's on the carriage. I'll see if I can get some pictures.
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@fma the cutter is using a standard Xacto knife blade. Here are some pics
John
Founder of Hydra Research LLC, developers of the open-source 3D printers and providers of 3D printing services.
https://www.hydraresearch3d.com/ -
I'm thinking to add a cutter under the extruder. This way, cut tips stay in the hotend, and are pushed again by the new filament during the purge, so no need to evacuate them. Ideally, it would be nice to be able to cut the filament when it is still soften, above the melt chamber, but I don't think ti would be easy...
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@fma No, that does not sound easy. We had to use the method we did because our tool head is pretty complex and already has a magnetic hotend cartridge system, so something like that would not fit on our tool head and would make that portion of the printer too complicated.
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BTW, I made some quick tests cutting filament with hot wire (easy to build, with a NiCr wire + led current driver). I didn't not spend much time: it cut very well, but leaves some small borders on the tip of the filament. I need to dig further this method.
BTW, I'm wondering if having the nozzle drilled at 1.7mm instead of 2mm could help to avoid bad tips?
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@fma That sounds interesting, would love to hear more if you ever to any more testing.
Yes, I have had the same thought about the diameter of the nozzle, however, this would mean you would only be able to use expensive filament with a very good manufacturing tolerance.
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Well, I said 1.7mm, but yes, 1.8mm would be better. But not 2mm...
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Excited to see the progress on it! I for one would be interested in hardware kit, though I might try to see if it would be possible for me to fabricate some of the non printed pieces in my university's metal shop.
Is everything running well on the firmware side of things?
almost an engineer
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The firmware is running fine. We are still ironing out a few minor issues.
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@red-sand-robot Glad to hear you would be interested in a kit. We will need to see interest from more people before we would make an official kit. However, if we don't do a kit we can definitely help you out with the hard to find/custom parts if you need them.
John
Founder of Hydra Research LLC, developers of the open-source 3D printers and providers of 3D printing services.
https://www.hydraresearch3d.com/ -
@jckray How much, roughly, did the NEMA 17 with the custom shaft? I have already begun printing the parts for your MMU system, so far so good!
almost an engineer
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@red-sand-robot The MOQ was 10 units, It was several hundred dollars for the whole order. I'd be happy to sell you one, so you don't have to deal with all that. I'll get the motor listed in the parts section of our website, and post here when it is there.
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@red-sand-robot The Nema 17 with 100mm shaft is available on our website now https://www.hydraresearch3d.com/parts/qmpid8sbp277kcd25a9wrngcqywaqr-j3j2n
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BTW, did you consider using PTFE tube with ID of 2.5mm, instead of 2mm? This should solve a lot of issue coming from bad tips.
I'm waiting for mine (seems to have been lost between UK and France
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