The filament going in is touching one side of the hobbed roller and then it touches the other side of the hobbed roller coming out, so the filament is being grabbed in synchronicity 2 times.
Last Edit: Aug 25, 2015 9:02:35 GMT -5 by ZionPhil
The filament going in is touching one side of the hobbed roller and then it touches the other side of the hobbed roller coming out, so the filament is being grabbed in synchronicity 2 times.
So just use 2 hobbed rollers, one to either side of the filament, you can drive both from the same stepper. Creating a loop like that is simply adding even more resistance and probably canceling out any benefits you might be gaining. Are they trying to squeeze this through a 0.1 nozzle or something. Why do people think they need so much torque? I don't see the issue about using a single hobbed roller.
Some things are meant to be closed. Your mind isn't one of them.
The filament going in is touching one side of the hobbed roller and then it touches the other side of the hobbed roller coming out, so the filament is being grabbed in synchronicity 2 times.
So just use 2 hobbed rollers, one to either side of the filament, you can drive both from the same stepper. Creating a loop like that is simply adding even more resistance and probably canceling out any benefits you might be gaining. Are they trying to squeeze this through a 0.1 nozzle or something. Why do people think they need so much torque? I don't see the issue about using a single hobbed roller.
I was thinking the same thing about the curve, but it would have to be measured to be fair.
Unless your trying to push it through an orifice that is too small, I really don't see the need - what problem is it solving? Do different materials require it perhaps? or is this to over come the boden tube issue? I don't know, I still don't see the need. If you are grinding your filament, then something else is wrong.
What would make sense is a clutch system so it doesn't grind the filament, but rather slips past, alerting you that something is jamming.
Some things are meant to be closed. Your mind isn't one of them.
Unless your trying to push it through an orifice that is too small, I really don't see the need - what problem is it solving? Do different materials require it perhaps? or is this to over come the boden tube issue? I don't know, I still don't see the need. If you are grinding your filament, then something else is wrong.
What would make sense is a clutch system so it doesn't grind the filament, but rather slips past, alerting you that something is jamming.
He does mention that it will do soft filaments (ninjaflex) and such much better, because there is no spring tension (or low tension) developed this way.
You oughtta see the dual-hob design that Brian's been scheming about, then. The parts of the design that I've seen are awesome!
Photo and / or info?
patience boys, I am working on it. to soon to show much. but I do have a name for it, the TrickDog extruder. what do you think?
Glenn, your so negative sometimes. If you don't have issues with your extruder, then great, more power to ya. But others DO have issues of slipping and grinding filament with current options. Deny it all you want, but it is a real problem. Sometimes print speed is limited by wimpy extruder. Don't poopoo others for pushing the envelope and trying to improve stuff. wheres the Maker Creativity in that?
I like it to. Interestingly different way of doing it. It just might work, worth a try anyway. Although the loop may cause extra friction, but maybe not. could the loop be a series of bearings?
patience boys, I am working on it. to soon to show much. but I do have a name for it, the TrickDog extruder. what do you think?
Glenn, your so negative sometimes. If you don't have issues with your extruder, then great, more power to ya. But others DO have issues of slipping and grinding filament with current options. Deny it all you want, but it is a real problem. Sometimes print speed is limited by wimpy extruder. Don't poopoo others for pushing the envelope and trying to improve stuff. wheres the Maker Creativity in that?
I never said it wasn't a problem, I DO know that it IS a problem, BUT fix the actual problem and NOT the SYMPTOM. The filament grinding is the symptom of an actual problem else ware in the system. If you weren't' wasting your time re-inventing the wheel you would see that. As we all know that printing faster = crappier parts so everyone ends up slowing it down anyways. Sure, you can print a bit faster with a more precision machine but You can only force so much plastic threw any given nozzle size at any given speed, even if you stop your extruder from slipping. You want to print faster, use a larger nozzle. It's not negative thinking, it's common sense and simple laws of physics. I've already proven time and time again that the Boden tube causes a tremendous amount of friction and resistance - and even worse with a sharp bend like this set up has so I really doubt this set up is gaining much, perhaps just enough to stop the stripping and probably they would get the same results with a little bit stronger spring.
Brian, you have a lot of good ideas, but over engineering only causes more issues, more things to break. To me, the filament stripping is a good thing. It tells me something else is wrong. If I prevent my extruder from slipping - what else is going to break in it's place? Your idea of a Filament counter is a much better solution, it can at least alert me that my filament is starting to grind before things get to out of hand. And it can probably be implemented into the firmware telling the machine to stop the print if unattended, or perhaps "auto-adjust" and slow the print speed down to see if that stops the slipping. If the extruder is simply built "not to slip", then the boden tube breaks(or something else) and I still end up with spaghetti on the floor.
Just because I think differently than you doesn't make me less creative.
Side note: I do agree that the EZ-Stuger is a bit whimpy for some of the other filaments like Carbon Fiber and Nylon - but again, only so much material is going to go threw the nozzle so fast. Then you have Die swell to worry about.
Last Edit: Aug 31, 2015 15:01:57 GMT -5 by BeeAmaker
Some things are meant to be closed. Your mind isn't one of them.
