Technical › Forums › Technical Support › Extruder Failure
This topic contains 13 replies, has 5 voices, and was last updated by Sarah 3 years, 6 months ago.
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February 27, 2015 at 1:03 pm #16023
Hi all,
I’ve made a support ticket for this but the last one took a week for them to respond with nothing more than a request for more information so I figured I’d try here too.
My Robox so far has been one problem after the other. The first one I received was so poorly aligned I couldn’t calibrate the gantry to print across the whole bed. On one side the plastic didn’t touch and on the other the head was digging into the bed. Sent it back, got a new one. This one the fine nozzle feed tube was cracked or something as the plastic oozed out inside the head and caused a blockage. Sent it back, got a new one. The reels that came with the printer were so tangled I would have had to completely unravel them and rewind them by hand, got new ones.
It seemed to print ok for a couple weeks, there has been lots of filament slip which is incredibly frustrating since as far as I can see there is no reason for it, the reels aren’t tangled. I have calibrated every which way, nothing helps.
Now the filament won’t load at all. I feed it through, it gets to the point where the extruder has just grabbed it, the printer makes a very upset noise and I get an error, something like “filament feed failed, try cutting the end square.” I do this and it does not help. Sometimes I can eject the filament using the eject button, sometimes I have to use the manual feed buttons because the eject button is still grayed out.
I want to open this thing up and see what’s wrong but I’m waiting for support to tell me to do that so I don’t void my warranty. Is there anything else I can try while I wait?
February 27, 2015 at 3:19 pm #16048You can go in advanced settings, under reel u find filament diameter, lower it a bit, write it to reel and see if that helps.
February 27, 2015 at 3:48 pm #16052edit: totally wrong plase posted i
Attachments:
You must be logged in to view attached files.February 27, 2015 at 7:37 pm #16079Thanks poju, I tried what you suggested and it didn’t change anything. 🙁 I also tried making it bigger and this also changed nothing.
February 27, 2015 at 7:42 pm #16080It sounds like you have debris in the extruder. This usually happens if there is skipping. The extruder teeth cut off little shavings of material and they build up both in the teeth and in the surrounding frame until the extruder won’t feed properly. I have also found that PLA material tends to build up little strings around the extruder parts that turn until it jams them. At this point I can tell you with almost perfect certainty that support will either replace your extruder or tell you how to clean it. Cleaning the extruder is a common maintenance issue.
Sorry to hear you have received some bad ones. In the future, if your gantry gets out of line, you can turn off and unplug the Robox and turn the right screw with your fingers to realign the gantry manually before running the alignment program. I usually find that the alignment program takes three or four tries to get a good one as the adjustments get smaller and smaller each time you run it. And the failed seal in the head does happen. I have lost several heads to that fault, it should just be a replacement head to fix it.
Once you get a good unit, they are very nice machines. I am still amazed at some of the parts that I get out of my machines; I printed some the other day that are 3/8″ diameter and 1/4 inch tall and they came out perfectly. I don’t use PLA or ABS, though, I prefer PET and nylon.
I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
www.hudsondesignlabs.comFebruary 27, 2015 at 7:50 pm #16082Thanks for the response, given what I’ve read here I was starting to think it was something like that. When this thing did work I really liked printing in PLA but there was a ton of filament slip (ABS had even more). Then for a while I had one reel that printed perfectly. Of course I decided to try a different color and everything went downhill! I believe I have some PET (t-glase) that I will try once this is working again.
Once I actually got in touch with customer service they were very quick about sending replacement parts for the past issues, it’s just unfortunately hard to get in contact with them.
February 27, 2015 at 7:56 pm #16083CEL is pretty swamped. Between getting improvements made and some personnel turnover, they are short-handed. They will get to you, just give them time. But yes, it can take a week or two sometimes. They also don’t get back to you until they have a solution or need more info, so that may be part of your issue with response time. I think my last response time was 3 days but that was a pretty clear-cut failure.
I have noticed also that PET and ABS colors affect use. I have six or eight CEL reels of material that I don’t use except for calibration because I don’t like the results. I found T-Glase and almost all my prints have been that or ColorFabb’s _XT, which is similar but less flexible. _XT gives great prints for overhangs and sticks to the bed really well.
I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
www.hudsondesignlabs.comFebruary 27, 2015 at 8:05 pm #16084@shudson did you know we also have @bhudson on the forum 🙂
He may actually be able to help, however it is hard to diagnose extruder issues without taking a good look at it and potentially opening it up.
The filament not loading could be due to worn sensors, also something that may require you to get to the extruder to fix it.
It may be best to wait for cel if you have some warranty concerns, in the meantime there is a lot of good info on the forum on the issues you experience, you should be able to find those threads with a simple word search.
Moh
March 2, 2015 at 2:04 pm #16163sometimes when you eject filament there is a string of melted filament stretched away from the melted plastic still in the head. This gets pulled up the bowden tube and tends to break off in the extruder gears. The eject sequence has been designed to minimise this by dropping to 140°C before ejecting but occasionally there will be a string.
You might find that you can use the following commands to push this string out of the gears by manually running them forward (toward the head). Because the filament is not loaded the usual buttons will not be active (ie Loaded is false in the Diagnostics tab) so you will have to use gcode commands to run the extruder forward or backward. Please don’t use these commands to push filament through the head as the rates of flow could damage the head.
To cause the extruder to run forward 100 units open the gcode entry box found in the advanced tray and type the following line followed by Enter (or press Send Gcode).
g0 e100
The above command will run the extuder as if it was feeding filament toward the head for 100 units, if you used -100 it would feed away from the head.
This might push the string out of the gears, if not you can try running the command again with the filament pushed in.
Sarah I see you have already created a ticket for this issue but for anyone reading this; If you still cant load please create a ticket on the support portal.
Chuckles @mistsoul, the times of those posts got the best of you.
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This reply was modified 3 years, 6 months ago by
Pete.

For official support please visit www.cel-robox.com/support/ and create a ticketMarch 2, 2015 at 3:00 pm #16168Thanks, @pete. I tried that with no filament and there were no horrible noises (probably did it 20 times or so), it seemed to run the extruder fine. When I tried to load the filament I got the same error and the same noise. When I ran that code (tried both directions) with the filament I still got the same error and the same noise. The filament then got stuck and I had to use the manual buttons/commands to get it out again.
March 2, 2015 at 3:10 pm #16170hmm, best to speak with the guys on the support portal. (Advice i give here sometimes gets used irresponsibly or in error)
It might be as simple as having some debris in the extruder or feed gears but could be worse, like a stripped worm wheel (one of the drive gears).

For official support please visit www.cel-robox.com/support/ and create a ticketMarch 2, 2015 at 3:49 pm #16171 -
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