Extruder motor struggles past nozzel January 23, 2016 10:07AM |
Registered: 8 years ago Posts: 61 |
Re: Extruder motor struggles past nozzel January 23, 2016 06:31PM |
Registered: 10 years ago Posts: 14,672 |
Re: Extruder motor struggles past nozzel January 24, 2016 04:39AM |
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Re: Extruder motor struggles past nozzel January 24, 2016 05:35AM |
Registered: 8 years ago Posts: 61 |
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dc42
One possibility is that you have a partially failed driver chip such that one of the two motor phases can only be energised in one direction. One way to test this is to swap the extruder motor cable with one of the tower motor cabless (with the power off!) and use the M569 command to swap them in firmware too. See if that moves the problem to the tower that you switched the extruder motor with.
However, there is probably a simpler explanation, so let's see what suggestions other users come up with.
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dougal1957
Didn't the design of the extruder change from the Beta to the Released Version Check that you had the parts for the release version printed and not the Beta ones
Byteslinger AFAIK got the very last Fisher hardware kit and had to source the printed parts separately so this is a possibility
Re: Extruder motor struggles past nozzel January 24, 2016 07:28AM |
Registered: 9 years ago Posts: 1,159 |
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ByteSlinger
Quote
dc42
One possibility is that you have a partially failed driver chip such that one of the two motor phases can only be energised in one direction. One way to test this is to swap the extruder motor cable with one of the tower motor cabless (with the power off!) and use the M569 command to swap them in firmware too. See if that moves the problem to the tower that you switched the extruder motor with.
However, there is probably a simpler explanation, so let's see what suggestions other users come up with.
I really hope this isn't the case
I'll try and give this a try today. Apologies but how exactly do I use the M569 command to swap them in the firmware?
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dougal1957
Didn't the design of the extruder change from the Beta to the Released Version Check that you had the parts for the release version printed and not the Beta ones
Byteslinger AFAIK got the very last Fisher hardware kit and had to source the printed parts separately so this is a possibility
Good thinking but yes I definitely have the latest design. It's the geared extruder motor block that this one is running.
Re: Extruder motor struggles past nozzel January 24, 2016 10:13AM |
Registered: 8 years ago Posts: 61 |
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dougal1957
Quote
ByteSlinger
Quote
dc42
One possibility is that you have a partially failed driver chip such that one of the two motor phases can only be energised in one direction. One way to test this is to swap the extruder motor cable with one of the tower motor cabless (with the power off!) and use the M569 command to swap them in firmware too. See if that moves the problem to the tower that you switched the extruder motor with.
However, there is probably a simpler explanation, so let's see what suggestions other users come up with.
I really hope this isn't the case
I'll try and give this a try today. Apologies but how exactly do I use the M569 command to swap them in the firmware?
Quote
dougal1957
Didn't the design of the extruder change from the Beta to the Released Version Check that you had the parts for the release version printed and not the Beta ones
Byteslinger AFAIK got the very last Fisher hardware kit and had to source the printed parts separately so this is a possibility
Good thinking but yes I definitely have the latest design. It's the geared extruder motor block that this one is running.
Just realised that you have changed filament at the time this started Filaments are not all the same I would try with a hotter hotend than 190 (Esun which is what RRP supplied does work at around 190 some others may go as high as 220 or so.
Re: Extruder motor struggles past nozzel January 24, 2016 11:19AM |
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Re: Extruder motor struggles past nozzel January 25, 2016 05:15AM |
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Re: Extruder motor struggles past nozzel January 25, 2016 02:06PM |
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Re: Extruder motor struggles past nozzel January 25, 2016 09:15PM |
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Re: Extruder motor struggles past nozzel January 28, 2016 08:15AM |
Registered: 8 years ago Posts: 61 |
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DADIY
Are you trying to extrude too much, you might need to set the extrude amount down to 1 or 5 if you're any higher then the motor can struggle. Also try increasing the temperature a little 190 may be a little low depending on the filament your using.
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PRZ
Printing well the robot may be a false signal, because it is made to print well, even if its is a bit challenging for cooling.
What occurs frequently while starting a machine is that the filament doesn't slide well at the inlet or outlet of the bowden tube, because the cleaning with a bit was not sufficient of because the bowden is screwed with too much torque, which reduce its internal diameter, as PTFE is quite 'soft'.
So you may try:
- Sligthly unscrew the brass end on extruder side
- Sligthly unscrew on hotend side. I systematically unscrew by a half turn after screwing on the hotend
Also, the extruder tensioner shall not be abusively tightened. If the filament don't slip that ok. However, the motor shall skip steps while there is a blockage, but not grind the filament.
With mine it's not so much that the extruder is slipping, but the motor actually struggles to push. If I watch the manual knob on the end of the extruder motor column, it turns fine and smoothly till it reaches the hot end, then it basically just sits static and shakes (occasionally with a little jump/jerk forward).Quote
FragrantParrot
I'm having a very similar issue. As soon as I start to print or extrude anything my extruder starts slipping incredibly easily, yet it functions fine feeding it through the Bowden tube even at 60mm/s.
The problems occur when it reaches the hotend, and the extruder just slips and won't extrude much if at all.
Re: Extruder motor struggles past nozzel January 30, 2016 06:13PM |
Registered: 8 years ago Posts: 61 |
Re: Extruder motor struggles past nozzel January 30, 2016 07:38PM |
Registered: 8 years ago Posts: 61 |
Re: Extruder motor struggles past nozzel February 08, 2016 05:32AM |
Registered: 9 years ago Posts: 1,159 |
Re: Extruder motor struggles past nozzel February 08, 2016 09:38AM |
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Re: Extruder motor struggles past nozzel March 10, 2016 10:24AM |
Registered: 8 years ago Posts: 61 |
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DADIY
You seem to have a lot more plastic being extruded than I do on my fisher which makes me wonder if you are over extruding. If I use the extrude button too much then my motor will crunch when too much pressure of filament builds up, the side affect of over extrusion is that you can clog up the extruder.
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DADIY
Just as a thought, have you got your steps per mm set correctly in config.g - you should have this line by default that sets this.
M92 E310 ; Set to 137 for direct drive. Set extruder steps per mm
Also in your slicer are you using the defaults. 1.73mm filament and 95% extruder. Also in the web interface I assume you have extruder at 100%.
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DADIY
If all of those things check out I would be inclined to extract the filament and dismantle the hot end. You can probable cheat this by cutting the cable ties by the fan and removing the two screws from the bottom, the hot end should push through and then unscrew the heat sink so that you can visually see if everything is clear. Also whilst you have the bowden tube disconnected you can slide some filament through and feel for anything snagging.
Re: Extruder motor struggles past nozzel March 10, 2016 09:05PM |
Registered: 9 years ago Posts: 189 |
Re: Extruder motor struggles past nozzel March 10, 2016 09:08PM |
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Re: Extruder motor struggles past nozzel March 11, 2016 04:41AM |
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Re: Extruder motor struggles past nozzel March 11, 2016 06:28AM |
Registered: 10 years ago Posts: 14,672 |
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ByteSlinger
[[b]DC42[/b], a few people have suggested that I speak to you if no solutions come up here. Apparently you are not too far from me in Bristol? Do you think this is something you'd be willing to take a look at if all else fails and I were to bring it to you?
Re: Extruder motor struggles past nozzel March 16, 2016 07:30AM |
Registered: 8 years ago Posts: 20 |
Re: Extruder motor struggles past nozzel March 20, 2016 08:13AM |
Registered: 8 years ago Posts: 61 |
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dc42
I helped someone else with a similar problem this afternoon. These are the steps we took:
1. The original filament (supplied with the machine I am told) didn't extrude cleanly, but formed a glob attached to the nozzle. We switched to a roll of eSun PLA I had.
2. Dismantled the hot end, unscrewed the nozzle from the heatsink, then screwed it back in but with thermal transfer compound on the nozzle threads this time.
3. Reassembled the hot end without the Bowden tube. Checked that we could push filament through the hot end when it was hot.
4. With the Bowden tube connected, the extruder drive could mostly extrude into free air at 5mm/sec, but occasionally skipped steps. We increased the motor current to 1200mA and the temperature to 210C, then it skipped steps only very occasionally.
5. With power off, swapped the E0 and X motor cables over on the Duet, then tested the printer after sending M569 commands to account for the swap. This was to check that there wasn't a fault on the E0 driver chip.
6. After experiencing a period of time when the extruder motor just vibrated instead of moving, checked all the connections in the extruder motor cable and re-made some.
[EDIT] 6a. Did several cycles of heat to 200C, extrude, cool to 100C, retract filament completely and cut off the end, to remove any foreign matter from the nozzle.
7. Did a 35 minute test print, initially at 1200mA current and 210C. It went well (no skipped steps noticed), so part way through we dropped the temperature to 205C. It continued to print well.
My conclusion is that the Fisher 1.0 extruder is slightly under-powered. It would be better with a higher torque motor or increased gearing. It's OK at 50mm/sec print speed, but can't consistently manage the ~5mm/sec rate needed for 100mm/sec print speed.