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printer randomly stutters during print  

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mlmarklamb142
(@mlmarklamb142)
Active Member
printer randomly stutters during print

Since the latest firmware release (fw_3_7_2_mk3s) the printer will occasionally start stuttering like the processor can't keep up with the program. Usually stutters for 1 to 1 1/2 minutes then clears up and starts printing like it's supposed to. Sometimes it will do this multiple times during a single print. Today, on a 20 minute print, it happened twice. The attached video shows it stuttering, then clearing up. Any ideas as to what's happening ?  

This topic was modified 2 years ago by mlmarklamb142
Posted : 28/07/2019 2:04 pm
mlmarklamb142
(@mlmarklamb142)
Active Member
Topic starter answered:
RE: printer randomly stutters during print

Is there a problem with uploading videos, or am I missing something ???

Posted : 28/07/2019 11:55 pm
Dave Avery
(@dave-avery)
Honorable Member
RE: printer randomly stutters during print

drag  and drop the video into the edit box and the set the media link in the popup

Posted : 29/07/2019 12:01 am
mlmarklamb142
(@mlmarklamb142)
Active Member
Topic starter answered:
RE: printer randomly stutters during print

20190728_093011

Thanks david-a66

Posted : 29/07/2019 12:20 am
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(@)
Illustrious Member
RE: printer randomly stutters during print

Are you printing from the SD card or via USB?

Posted : 29/07/2019 8:06 am
mlmarklamb142
(@mlmarklamb142)
Active Member
Topic starter answered:
RE: printer randomly stutters during print

I was printing from usb. Most of my prints are from usb, but it never happened until after the firmware update. Could be just a coincidence.

Next few prints I'll try running from the sd.

Posted : 30/07/2019 9:27 pm
mlmarklamb142
(@mlmarklamb142)
Active Member
Topic starter answered:
RE: printer randomly stutters during print

Ran a print from the sd-card today, a little over 2 hrs. No stuttering at all. I'll try a few using the sd, then run a few more from the usb and see what happens.

Nobody else has had this problem ???

Posted : 01/08/2019 5:26 pm
rmm200
(@rmm200)
Noble Member
RE: printer randomly stutters during print

Only ones I have heard of are using Pi Zero. What do you have plugged into your USB?

Posted : 01/08/2019 5:42 pm
Nikolai
(@nikolai)
Noble Member
RE: printer randomly stutters during print
Posted by: mlmarklamb142

Nobody else has had this problem ???

None I've seen so far on github. If it's  happening only with usb connection, then it's most likely the PC/Raspi you're using causing this issue.

Often linked posts:
Going small with MMU2
Real Multi Material
My prints on Instagram...
Posted : 01/08/2019 5:45 pm
bobstro
(@bobstro)
Illustrious Member
RE: printer randomly stutters during print

There have certainly been reports of USB printing causing problems. After spending many posts trying to assist someone with similar problems only to find that they'd neglected to mention they were printing over USB, I've added it to my list of extruder click troubleshooting questions. The obvious question is what's on the other end. The Raspberry Pi Zero is hard put to do both USB and wifi concurrently, for example.

I'd only experienced a layer shift once in 18 months of owning my Prusa and printing exclusively via SD. Since connecting via USB, I've had it happen a half dozen times in the last month. (Moral: Don't load up the CPU during timing-sensitve prints.)

Always simplify when troubleshooting.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 01/08/2019 6:18 pm
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(@)
Illustrious Member
RE: printer randomly stutters during print

Microsoft Windows is NOT an RTOS.  Nor are most Linux builds. Garbage collection can do all sorts of weird things to communications that require software polling.

Posted : 02/08/2019 3:11 am
mlmarklamb142
(@mlmarklamb142)
Active Member
Topic starter answered:
RE: printer randomly stutters during print

Not running a raspberry and the only things plugged into usb is the printer, external hard drive and the wireless gizmo for logitech keyboard and mouse.

Posted : 02/08/2019 3:28 pm
bobstro
(@bobstro)
Illustrious Member
RE: printer randomly stutters during print
Posted by: mlmarklamb142

Not running a raspberry and the only things plugged into usb is the printer, external hard drive and the wireless gizmo for logitech keyboard and mouse.

So yes, you are printing via USB. Try printing the same gcode directly off the SD card and see if there's an improvement. If so, you've got your answer. If not, update the info you've posted. That's the best troubleshooting process at this point.

(A USB hard drive can push the USB bus pretty hard, especially if you've got crappy drivers that use a lot of CPU power. USB2 or 3 may make a difference as well.)

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 02/08/2019 4:15 pm
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(@)
Illustrious Member
RE: printer randomly stutters during print

For an abundance of clarity: what folk are asking is for you to remove the USB cable from the printer, insert the SD card into the printer, select the file to print.  The only thing connected to the printer should be the power cord.

Posted : 02/08/2019 6:54 pm
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