Strange blobs while printing Hi everyone! Have been printing fine for a good while now but lately I have begun to notice these strange blobs randomly on my prints. I have no idea why this keeps happening. It seems to be my nozzle extrudes too much filament at certain points for some reason. Has anyone seen this before? And if so, what was happening and what's the fix? Looking forward to hearing people's experiences of this Cheers https://reprap.org/forum/read.php?1,615071,615071#msg-615071 Tue, 09 Jun 2026 08:37:44 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,615071,615373#msg-615373 Re: Strange blobs while printing https://reprap.org/forum/read.php?1,615071,615373#msg-615373
Thanks again everyone]]> Printsperation General Mon, 25 Jan 2016 09:38:52 -0500 https://reprap.org/forum/read.php?1,615071,615234#msg-615234 Re: Strange blobs while printing https://reprap.org/forum/read.php?1,615071,615234#msg-615234
Apologies for not supplying more info (silly of me). I have a prusa I3 with a hexagon all metal hotend with bulldog lite extruder (therefore can't really see internally to the gear wheel). I print off and SD and my prusa I3 uses ramps 1.4 and uses Marlin firmware. Cura is my slicer.

I will try another print tonight and record what happens. It is typically only within the first few layers (normally third to fifth I think).

I didn't realise the hotend will sit in position if it loses temp, that would make sense as to what is happening though! I will monitor this tonight and record what happens. If this was the case, how would I overcome this? The printer is only a few months old so can't imagine the thermistor has become faulty?

Thanks again for the help so far!]]> Printsperation General Mon, 25 Jan 2016 04:43:54 -0500 https://reprap.org/forum/read.php?1,615071,615155#msg-615155 Re: Strange blobs while printing https://reprap.org/forum/read.php?1,615071,615155#msg-615155
However I would put money on this issue being related to your extruders retract operation. Watch the gear wheel on the extruder and see if you can tell if it is moving equal angle of rotation on both the retract and unretract operation. I suspect the retract is failing/skipping steps and so when you unretract, it is pushing out some plastic

Please also list what electronics, slicer and firmware you are using, and also what sw you are using to send gcode to the printer. This will help a lot in giving a quick solution to your problem.

In any event this appears to be a simple to solve setup problem once we have the above info]]> Mutley3D General Mon, 25 Jan 2016 00:11:20 -0500 https://reprap.org/forum/read.php?1,615071,615147#msg-615147 Re: Strange blobs while printing https://reprap.org/forum/read.php?1,615071,615147#msg-615147

Try printing using an SD card.]]> nebbian General Sun, 24 Jan 2016 23:47:32 -0500 https://reprap.org/forum/read.php?1,615071,615142#msg-615142 Re: Strange blobs while printing https://reprap.org/forum/read.php?1,615071,615142#msg-615142
Quote
Printsperation
Hi everyone!

Have been printing fine for a good while now but lately I have begun to notice these strange blobs randomly on my prints. I have no idea why this keeps happening. It seems to be my nozzle extrudes too much filament at certain points for some reason. Has anyone seen this before? And if so, what was happening and what's the fix?

Looking forward to hearing people's experiences of this

Cheers

It would be helpful if you can record a video of the print, but anyway here are my guesses:

1) hotend temperature problem, the hotend is heating up and therefore stops in position. this causes oozing and the blobs. you can check this by looking at the hotend temperature when the blob happens.

2) gcode problem, probably caused by bugs where the hotend stops in place and extrude. again, check this by looking at what the hotend does when the blob happens.]]> chngyian General Sun, 24 Jan 2016 22:56:14 -0500 https://reprap.org/forum/read.php?1,615071,615071#msg-615071 Strange blobs while printing https://reprap.org/forum/read.php?1,615071,615071#msg-615071
Have been printing fine for a good while now but lately I have begun to notice these strange blobs randomly on my prints. I have no idea why this keeps happening. It seems to be my nozzle extrudes too much filament at certain points for some reason. Has anyone seen this before? And if so, what was happening and what's the fix?

Looking forward to hearing people's experiences of this

Cheers]]> Printsperation General Sun, 24 Jan 2016 17:21:43 -0500