What diameter do you have cura set for? The default is 2.85 and given you reset that can have a similar effect. As I recall the prints it is 1.75
Skip to main content
I had the same issue a couple weeks ago. It got so bad that the stepper motor would click during printing. I tried everything from changing the motor current to disassembling the nozzle and cleaning it out. Replacing the hot end ended up being my only solution. I haven’t troubleshoot further but I suspect either debris was somewhere in the hot end or the thermistor was faulty. Before changing the hot end, I was able to feed it manually and by hand. I only got jammed while printing, like you. After replacing the hot end, it was like night and day. I had totally forgot how easy it should be to feed it by hand. The manual feed was also pushing out a lot more than it did before. So my old end was under extruding even when doing it manually, I just didn’t notice.
I’ve some knowledge of electronics. I have’t meshed with the wires. It there would be a faulty connection the motor would not rotate (completely) and I would see this happening when It retracts (witch it does how it should) or when I extrude manually.
Thanks for sharing this view though! 
I thought the same initially - but raising the extruder wont make a difference…
okay, if this is PLA, you should be using Blue Tape… If it’s ABS, is the bed hot enough? Not directly related, I know, but just to clarify.
This looks like the Jr V2 with the Aluminium Extruder upgrade and I have worked with one of these for ages and they’re quite stable. Have you tried different sliced models? do you have some previously sliced GCODE that you can try and print with?
The first layer does normally print slower, but parts of the print look okay, apart from a little squashed and not sticking particularly well (which is why I asked the first question).
Run the GCODE command M503 and check the line beginning M92. The value for E should be in the 93-96 region. If it is, then the motor should be turning as it should.
Physically, check the screw is not overtight and the temperature not too cold. I normally make sure there is enough tension to provide friction, but not overly tight as the drive gear will start to dig into the filament.
A few ideas there, you may find more answers on help.printrbot.com 2 or by opening a support ticket if you get really stuck
Ian
1: As I said - I did this. I even added a new printer etc.
2: As I said - I did this also
3: On my to do list
4: Cura doesn’t have a extrusion multiplier (?). Slic3er does though - no improvement.
6: As I said - did this also; both usb as direct SD.
This isn’t a copy-paste message ^^?
Yeah, it still could be the issue even if your motor doesn’t tick. The ticking is from heavy resistance that overpowers the motor.
I’m still not sure what the exact cause was. I’m leaning towards temperature issues though because it’s as if the melt zone never reached the tip anymore. I cleaned the crap out of that thing and it still jammed so I can’t think of what else it would have been.
When it got to it’s worst, there was a weird symptom when it got jammed. I wouldn’t be able to feed it by hand unless I pulled the filament out, trimmed it flush and reinserted it. That made me thing the tip wasn’t getting hot enough anymore and the filament was solidifying at the tip. So when printing rafts and simple parts, it would print fine because the flow was constant. The jams would start when there was constant retracting in the print process - so the filament at the tip just sat there and solidified.
My issues started when I used a new spool of filament that I just so happened to buy on eBay. I can’t prove it was the cause and it might have only been a coincidence. Needless to say, I threw that spool out just in case. With that spool, I had a bad print which somehow caused the print to detach and stick to my nozzle. This saturated the fiberglass sock with plastic and may have contributed to my issue. I tried flipping it around to see if the heat was being released too fast, but it didn’t help. It’s possible some plastic got up to the thermistor but I haven’t checked yet. One person in another thread suggested that I hadn’t screwed the tip on all the way. Thing is my issues started before ever messing with the tip. I could have made it worse by doing that though. Also, when you disassemble, make sure you have some spare ptfe tape for the tip. They use it on the threads.
This is the hot end I use. http://printrbot.com/shop/1-75mm-ubis-hot-end/ 19
I’m waiting very impatiently for the metal one to come back in stock… 
does it come apart? I took my nozzle apart last night (different kind) and thought i had it back together, but i was having issues with it not feeding, checked it while it was hot and it was not all the way back together, there was cooled plastic in the threads during reassembly. There was a space between the barrel, and the nozzle, which was catching the filament and not allowing it to make it to the nozzle. I disconnected the hot end from the “x” carriage and let it heat up to temp, and re tightened everything. Worked like new after that.
Mark,
I had the same issue with my printer this weekend. Turned out the room was too hot! (because of this heat wave in Central Europe) The fan on my extruder couldn’t handle the job and this caused the filament to overheat and melt in the upper part of the extruder, causing a blockage. I started noticing gaps in my print and it got worse. When I extruded manually, it worked fine, because the nozzle only warmed up temporarily. When printing automatically, the extruder overheated after 10-15 minutes.
Then I moved my printer to the cellar (where it’s still cool) and everything worked just fine! Since you mentioned that the problem started when you moved your printer, I thought this may be related…
Hopefully you’ll find the solution! Remember, from every problem you’ll learn something
Pieter
Did you get this figured out?
A few other possibility
- Printing too close to the bed
- Clog in the hot end
- Clogged extruder hob ( eg bits of plastic in between the teeth )
Hi Pieter,
I know about the heat wave - I was in the middle of it 
(nl)
I’ve read before that the room temperature affects the printing process - especially the quality of the filament. Direct sunlight and a high humidity are killing.
Sadly my problem isn’t temperature related - so I will look further. Thanks for sharing anyway, interesting!
-Mark
Hi Ian,
Even for PLA I use my beloved heated-bed. There is only one thing worse than using a glue stick for adhesion and that is blue tape ^^. The problem in the picture was under-extrusion; not enough filament to stick to the bed so it got loose
The sliced models are fine - and I set first layer print speed on purpose on 20m/s.
The M503 is a great tip to check if your motor is set to the right amount of steps per mm!
Just to be sure I unscrew the ‘tensioner’ and put it back together - along with removing the nozzle and cleaning it out that solved my issue!.
I appreciated your thoughts!
-Mark
UPDATE: as many suggested I removed the nozzle and cleaned it out. Same for the the ‘screw’ part on the extruder. I checked every screw and tighten it where needed. Furthermore I took the ‘tensioner’ apart and screw it back together.
That worked!
Here is a freshly printed bunny to thank you all for your suggestions!
Cool, glad you got it figured out. There is a really nice resource over at bukobot that I have been using for a while now and it works great. Lots less painful than a full tear-down.
nozzle-cleaning [Bukobot 3D Printer Instructions & Docs] 19 Its a really great article and shows exactly what to look for. I have found this necessary especially if going from a very high temp material to something like abs or pla as the nozzle still has a little material in there which can cause flow problems/increased back-pressure in the hotend.
I’ll definitely give this a try
wooooooo nice to know that it works! Great job buddy ! Also, for the printbot, i dont know if somebody told u earlier but when u do longer prints, u must have a cooling system for the extrusion head, for avoid clugs. Like this Extruder Fan Mount for Printrbot Simple by drewsloan - Thingiverse 11
Have a nice day
It’s almost silly for me to ask but a lot of problems on my printers arise when the fan that cool down the extruder start failing, almost imperceptible; most of the time when you are not there but it makes the filament softer and thus to under extrude. I’ve been through more than a dozen of those. They still work but they are not that smooth, same on the CTC with the PCB fan.
18 days later
I used a few old 12v computer fans to blow on the Printers to keep them a lil cool. They can get pretty hot on long prints. A small 12v and put the bot on some feet to allow air travel to pass under the bot.
Keep it cool,