Filament extruder recomendations
Posted by tanner331
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Re: Filament extruder recomendations January 23, 2015 01:41PM |
Are you the airtripper's designer ? That could explain a lot you cannot admit contradiction. You overflyed my signature without reading it. 
The airtipper I talk about was bought through ebay, I guess somebody may manufacture it... You're absolutely delight by Airtripper's extruder, it's fine to me. Please appreciate a significant amount of people had issues with it. You'll say that manufacturer does not follow the specs or whatever, and yours works fine. Good. Use the find section of this forum if you don't trust me. I don't criticize, as you friendly says, but I argue that a hose cannot replace a spring because of the material it is made out. Except expensive (and not easy to find localy) high pressure hoses, I don't know any hose that can stay in shape under continuous pinching.Plastics, rubber don't have the same elasticity and plasticity depending of temperature, and raw material's lack of memory. So it cannot be an equivalent of a metal spring which is much more stable and linear. The good vitamin to provide idler pressure, if you like. I guess you can find spare parts for cars localy anywhere on earth, but desert or jungle. I understand your may desagree, it's ok I respect your point of view.
Edited 1 time(s). Last edit at 01/23/2015 01:42PM by Zavashier.
Collective intelligence emerges when a group of people work together effectively. Prusa i3 Folger (A lot of the parts are wrong, boring !)
The airtipper I talk about was bought through ebay, I guess somebody may manufacture it... You're absolutely delight by Airtripper's extruder, it's fine to me. Please appreciate a significant amount of people had issues with it. You'll say that manufacturer does not follow the specs or whatever, and yours works fine. Good. Use the find section of this forum if you don't trust me. I don't criticize, as you friendly says, but I argue that a hose cannot replace a spring because of the material it is made out. Except expensive (and not easy to find localy) high pressure hoses, I don't know any hose that can stay in shape under continuous pinching.Plastics, rubber don't have the same elasticity and plasticity depending of temperature, and raw material's lack of memory. So it cannot be an equivalent of a metal spring which is much more stable and linear. The good vitamin to provide idler pressure, if you like. I guess you can find spare parts for cars localy anywhere on earth, but desert or jungle. I understand your may desagree, it's ok I respect your point of view. Edited 1 time(s). Last edit at 01/23/2015 01:42PM by Zavashier.
Collective intelligence emerges when a group of people work together effectively. Prusa i3 Folger (A lot of the parts are wrong, boring !)
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Re: Filament extruder recomendations January 25, 2015 07:28AM |
Hi Tanner,
There are several things to consider here.
1) The extruder is slipping because of poor spring (tube) pressure.
2) The extruder gear is slipping on the motor shaft or hobbed bolt.
3) The filament is changing size through your print... if it gets smaller, and the bearing does not maintain force on the filament, it will slip.
4) The motor is loosing steps during a print (current too low or chip overheating).
5) The force to push filament through the hot end is greater than the extruder can handle.
Each of the above can have multiple possible causes.
1) Extruded Filament Slipping...
Several things must happen for the extruder to work. A) The filament must flow freely through the extruder body (when not being gripped by the bobbed bolt and bearing).
The bearing must be free to move against the filament without obstruction (with no filament there, the bearing should move to touch the hobbed bolt). C) The hobbed bolt must be hobbed. D) The hobbed bolt must not be hobbed deeper than the filament diameter.
2) Extruder Gear Slipping...
A) The extruder gear slipping on the motor shaft is a real possibility. You could mark the gear and shaft face with an ink marker and check later to see if they have shifted during a print. The hobbed bolt is not likely to slip if the hex head of the bolt is seated in the molded plastic gear.
3) Filament Size
There's good and bad filament out there. If you don't have a set of calipers, get some. You need to know your filament diameter from roll to roll if you ever want good prints. We all put up with small changes in diameter, but if the extruder can't physically move against the filament to follow those diameter changes, you'll have problems.
4) Motor Loosing Steps...
Check current settings. Do you have heat sinks on the motor drivers? Check motor connections. Are wired connections to the motor being pulled on during a print? Is the motor over-heating (too much current). Is the print bad throughout does it show good layers and bad layers of printing?
5) Too hard to push filament...
You should be able to push filament through your hot end by hand with moderate pressure and watch it squirt out. If you have to really push hard then so does your extruder. I have the E3D v6 and I love it. You made a good choice. But how do we really know what temperature it is set at? If we chose the wrong thermistor setting in firmware, it may work but it may never work well. Or they could have sent you the wrong thermistor by mistake. How would you know? The suggested numbers they give on the hot end temperature are just that... suggested. Try warming the hot end up a bit and again by hand, push some filament through it. See if you feel a difference. If you're constantly shredding filament at your extruder then either the hot end is too cold, the tip is getting plugged, your not gripping the filament properly by the extruder, or you're trying to push too much filament too fast through the extruder.
Where to start?
If you can tie a nice heavy book to your filament and watch your extruder lift if off the floor (while disconnected from the hot end), then your extruder is working... maybe not perfect, but working. I would be checking your settings on how much filament your trying to push through the extruder. If you are trying to push too much too fast, it will shred your filament all day long. Also run some filament through your hot end by hand and see if it squirts out freely. If it's too hard to push by hand then focus your attention there.
If it prints great at first then something seems to change, then ask yourself why. Is it getting harder to push filament through your hot end? Is something preventing the filament from coming off the roll? is the extruder driver overheating? Has the hobbed bolt been slipping all along and slowly filling the hobbed bolt with crap so that it can't pull filament any more? Is the hot end staying hot? Is trash building up in the hot end from dirty filament?
I hope this helps!
Best of luck!
Ross
You don't need a parachute to skydive. You only need a parachute to skydive twice.
There are several things to consider here.
1) The extruder is slipping because of poor spring (tube) pressure.
2) The extruder gear is slipping on the motor shaft or hobbed bolt.
3) The filament is changing size through your print... if it gets smaller, and the bearing does not maintain force on the filament, it will slip.
4) The motor is loosing steps during a print (current too low or chip overheating).
5) The force to push filament through the hot end is greater than the extruder can handle.
Each of the above can have multiple possible causes.
1) Extruded Filament Slipping...
Several things must happen for the extruder to work. A) The filament must flow freely through the extruder body (when not being gripped by the bobbed bolt and bearing).
The bearing must be free to move against the filament without obstruction (with no filament there, the bearing should move to touch the hobbed bolt). C) The hobbed bolt must be hobbed. D) The hobbed bolt must not be hobbed deeper than the filament diameter.2) Extruder Gear Slipping...
A) The extruder gear slipping on the motor shaft is a real possibility. You could mark the gear and shaft face with an ink marker and check later to see if they have shifted during a print.
The hobbed bolt is not likely to slip if the hex head of the bolt is seated in the molded plastic gear.3) Filament Size
There's good and bad filament out there. If you don't have a set of calipers, get some. You need to know your filament diameter from roll to roll if you ever want good prints. We all put up with small changes in diameter, but if the extruder can't physically move against the filament to follow those diameter changes, you'll have problems.
4) Motor Loosing Steps...
Check current settings. Do you have heat sinks on the motor drivers? Check motor connections. Are wired connections to the motor being pulled on during a print? Is the motor over-heating (too much current). Is the print bad throughout does it show good layers and bad layers of printing?
5) Too hard to push filament...
You should be able to push filament through your hot end by hand with moderate pressure and watch it squirt out. If you have to really push hard then so does your extruder. I have the E3D v6 and I love it. You made a good choice. But how do we really know what temperature it is set at? If we chose the wrong thermistor setting in firmware, it may work but it may never work well. Or they could have sent you the wrong thermistor by mistake. How would you know? The suggested numbers they give on the hot end temperature are just that... suggested. Try warming the hot end up a bit and again by hand, push some filament through it. See if you feel a difference. If you're constantly shredding filament at your extruder then either the hot end is too cold, the tip is getting plugged, your not gripping the filament properly by the extruder, or you're trying to push too much filament too fast through the extruder.
Where to start?
If you can tie a nice heavy book to your filament and watch your extruder lift if off the floor (while disconnected from the hot end), then your extruder is working... maybe not perfect, but working. I would be checking your settings on how much filament your trying to push through the extruder. If you are trying to push too much too fast, it will shred your filament all day long. Also run some filament through your hot end by hand and see if it squirts out freely. If it's too hard to push by hand then focus your attention there.
If it prints great at first then something seems to change, then ask yourself why. Is it getting harder to push filament through your hot end? Is something preventing the filament from coming off the roll? is the extruder driver overheating? Has the hobbed bolt been slipping all along and slowly filling the hobbed bolt with crap so that it can't pull filament any more? Is the hot end staying hot? Is trash building up in the hot end from dirty filament?
I hope this helps!
Best of luck!
Ross
You don't need a parachute to skydive. You only need a parachute to skydive twice.
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