1 Topic by Jadonm1

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Topic: Press extruder stepper motor

After struggle after struggle I almost have my press working. Now it's the extruder stepper motor. Does anyone know of a good place to get a new stepper motor and what motor I need for the extruder?

2 Reply by IronMan

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Re: Press extruder stepper motor

Just out of curiosity, have you tried swapping the motor out for, say the X axis driver and see if it runs when you jog the X axis manually?

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3 Reply by Jadonm1

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Re: Press extruder stepper motor

The problem is the extruder clicking under very low resistance. I've tried adjusting the trimpots but I can't get it high enough. The extruder pins are all messed up and burned from when I first ran the printer(that was fun) I'm guessing it's a bad connection but I'll try hooking it up to the y axis.

4 Reply by trayracing

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Re: Press extruder stepper motor

If the contacts on the motor itself (not the cable) are messed up...
The extruder motor's label says SM42HT38-1684AC-01, and googling that yields specs at http://shop.myhobby-cnc.de/media/pdf/nema17.pdf, and some alibaba hits.

Nothing remarkable here - NEMA 17, 38mm high bipolar hybrid stepping motor. Match up the specs as best you can.

5 Reply by Jadonm1

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Re: Press extruder stepper motor

Well the more I test things the less certain I am that it's the actual stepper motor. But I still don't know what's causing the skipping.

6 Reply by AZERATE

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Re: Press extruder stepper motor

http://us.stepperonline.com/nema-17-ste … p-166.html
The given link should be comparable. From the same site, you could also get a .9 degree motor for an extra $4 http://us.stepperonline.com/9deg-nema-1 … p-267.html

The former would be more of a drop in replacement as far as settings. The latter would require some additional tuning, but no new carriages or extruder. Only the length is different and not by much.

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7 Reply by IronMan

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Re: Press extruder stepper motor

Jadonm1 wrote:

Well the more I test things the less certain I am that it's the actual stepper motor. But I still don't know what's causing the skipping.

Are you able to extrude with the nozzle in free air (not touching the build plate) without clicking?  If so, perhaps you are too close to the build plate for your first layer.

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8 Reply by Skyblue

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Re: Press extruder stepper motor

IronMan wrote:
Jadonm1 wrote:

Well the more I test things the less certain I am that it's the actual stepper motor. But I still don't know what's causing the skipping.

Are you able to extrude with the nozzle in free air (not touching the build plate) without clicking?  If so, perhaps you are too close to the build plate for your first layer.

Also check the set screw on the extruder gear...

9 Reply by Jadonm1

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Re: Press extruder stepper motor

Yes it does extrude fine in park away from the bed. The problem happens only during the print. And by increasing the z offset I've managed to print the first layer fine, but it starts again on the next layers. Maybe my e3d v6 Bowden setup is simply causing to much resistance.

10 Reply by IronMan

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Re: Press extruder stepper motor

Jadonm1 wrote:

Yes it does extrude fine in park away from the bed. The problem happens only during the print. And by increasing the z offset I've managed to print the first layer fine, but it starts again on the next layers. Maybe my e3d v6 Bowden setup is simply causing to much resistance.

If you heat up to extrude and release tension on the idler bearing at the extruder, then can you extrude by hand pressure just pushing the filament into the Bowden tube?

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11 Reply by Jadonm1

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Re: Press extruder stepper motor

Yup I can, it goes pretty hard though. Now I feel sorry for the stepper motor:P how can I cut down on resistance through the bowden tube?

12 Reply by IronMan

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Re: Press extruder stepper motor

One thing to make sure of is that your PTFE tubing is seated fully into the recess at the top of the Heat Brake of your E3D.  If it is not, this may cause resistance.

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13 Reply by Morganism

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Re: Press extruder stepper motor

Out of curiosity, are you using ABS or PLA? and what temperature?

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14 Reply by Jadonm1

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Re: Press extruder stepper motor

Morganism wrote:

Out of curiosity, are you using ABS or PLA? and what temperature?

ABS at 250C

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Re: Press extruder stepper motor

That's a bit on the high side...most normally run 240-245.  Has it ever clogged on you?

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16 Reply by Morganism (edited by Morganism 2015-12-08 17:34:13)

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Re: Press extruder stepper motor

If you have a stock extruder, try going lower. Start at 220-230, but the thermistor in Solidoodles is placed far away from the heater, and the temperature is actually higher than what it is usually showing on the screen. I usually run ABS at 200-210 and PLA at 175-185. If the temperature is too high it could cause problems like what you are seeing.

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17 Reply by IronMan

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Re: Press extruder stepper motor

He's running an E3D… Look at his signature

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18 Reply by Morganism

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Re: Press extruder stepper motor

Damn, missed that and I looked in his post for that too. Still would like to see what happens at 225.

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19 Reply by IronMan (edited by IronMan 2015-12-08 19:04:18)

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Re: Press extruder stepper motor

Yep...I've run some ABS filaments pretty well at around 230-235

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20 Reply by Jadonm1

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Re: Press extruder stepper motor

I lower'd the temp to 225C and it did good till the 3rd layer, then "click click click click" And it still feeds filament through pretty hard. I'm about ready to make a direct drive mount or something.

21 Reply by Morganism

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Re: Press extruder stepper motor

I want to make sure I read your earlier posts correctly. When the head is parked in a home position it will extrude with no problem? It is only when you start to print that it has a problem? All at the same temperature?

If that is true, I believe you have a software/firmware setting that is incorrect because it is mechanically working in the home position.

If you are seeing improvement, but not correction at 225--it may simple not be low enough and your temperature is still too high.

In either case, I do not believe a direct drive would fix you problem. If it is something drive related, mostly likely the gear that feeds the filament in is stripped and might need to be replaced. However, if that were true you would be getting the clicking almost all the time, it would not work differently in a parked position than in a running position.

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