Extruded filament is "pulsing" out of the nozzle May 11, 2015 03:31PM |
Registered: 8 years ago Posts: 10 |
Re: Extruded filament is "pulsing" out of the nozzle May 11, 2015 06:22PM |
Registered: 10 years ago Posts: 581 |
Re: Extruded filament is "pulsing" out of the nozzle May 12, 2015 09:08AM |
Registered: 10 years ago Posts: 1,401 |
Re: Extruded filament is "pulsing" out of the nozzle May 12, 2015 02:48PM |
Registered: 8 years ago Posts: 10 |
Quote
3dkarma
It might be worth checking the hobbed bolt in your extruder (if there is one, otherwise the drive gear) for consistent diameter. Changes in the amount of grip it has on the filament may cause the pulsing you're describing. I would also look for any misalignment of the hobbed bolt and drive gears. Also check your filament diameter along a reasonable length to see if the diameter is consistent.
Quote
ggherbaz
Check your stepper driver, have you adjust the trimpod? Have you swap drivers? Sounds to me like your driver is at the barrier of been overpowered, does the stepper gets hot?
Re: Extruded filament is "pulsing" out of the nozzle May 12, 2015 02:57PM |
Registered: 10 years ago Posts: 1,401 |
Re: Extruded filament is "pulsing" out of the nozzle May 12, 2015 05:11PM |
Registered: 10 years ago Posts: 581 |
Quote
Puckit
Doesn't the drive gear has to have an inconsistent diameter because it is hobbed...?
Re: Extruded filament is "pulsing" out of the nozzle May 15, 2015 04:56PM |
Registered: 8 years ago Posts: 10 |
Quote
ggherbaz
I can't answer that, but constant high temperatures will deteriorate the enamel protection on the coils and once gone your stepper is dead. Try to bolt a 40x40x10 aluminum heatsink in the back of the stepper if you have space or use self-adhesive thermal tape and put the heatsink on top of the stepper and see if that helps.
Quote
3dkarma
The hobbed part has a smaller diameter than the rest of it, but I'm talking about checking whether or not the hobbed part is oval in cross-section or circular.
Re: Extruded filament is "pulsing" out of the nozzle May 16, 2015 06:04AM |
Registered: 8 years ago Posts: 10 |
Re: Extruded filament is "pulsing" out of the nozzle May 16, 2015 08:12AM |
Registered: 10 years ago Posts: 581 |
Re: Extruded filament is "pulsing" out of the nozzle May 16, 2015 10:59AM |
Registered: 10 years ago Posts: 9 |
Re: Extruded filament is "pulsing" out of the nozzle May 19, 2015 01:01PM |
Registered: 8 years ago Posts: 10 |
Quote
3dkarma
It looks like your stepper motor is skipping steps. I can see that you've got a direct drive extruder - it may be that your stepper motor isn't strong enough to push the filament through. Can you post the model number of the motor? We should be able to look up how strong it is from that. You will possibly need to consider switching to a geared extruder or swapping out the motor for something stronger.
Quote
DeltaDroid
If the extruder stepper is getting hot it can only mean one of 3 things which I would test in this order:
1) Too much current, turn down trim pot in very small steps and test. I had this issue when I built my first 3d printer. Using a multimeter or ohm meter with micro-clips makes the process very easy.
2) Faulty stepper driver. Try swapping the extruder stepper driver with one of the other sticks. It's not uncommon to receive faulty stepper drivers.
3) Faulty stepper motor (bad bearings, bad coils, partial internal short, etc). It's possible that your stepper was running too hot for an extended period and suffered damage as a result. A few of the cheper stepper motors I purchased a while back had dry bearings and were revived with a little lubrication.
I do 1/16 microstepping on my extruder without issue but I use a wade style geared extruder. Geared extruders are more energy efficient, they're easier on the motor and of course they provide much more torque. The only better option would be a geared stepper motor with direct drive.
Re: Extruded filament is "pulsing" out of the nozzle May 19, 2015 02:01PM |
Registered: 9 years ago Posts: 1,873 |
Re: Extruded filament is "pulsing" out of the nozzle May 26, 2015 02:58PM |
Registered: 8 years ago Posts: 10 |
Quote
JamesK
What voltage do you run your stepper drivers at? The datasheet specs that as a 12V motor (hence the low 0.4A current rating). The stepper drivers can't microstep accurately unless they get into the current limiting regime, which with that motor it won't unless you are using substantially more than 12V drive voltage.
Re: Extruded filament is "pulsing" out of the nozzle May 26, 2015 03:39PM |
Registered: 9 years ago Posts: 1,873 |
Re: Extruded filament is "pulsing" out of the nozzle May 28, 2015 08:42PM |
Registered: 8 years ago Posts: 1 |
Re: Extruded filament is "pulsing" out of the nozzle June 04, 2015 06:57AM |
Registered: 8 years ago Posts: 10 |