This topic contains 26 replies, has 5 voices, and was last updated by 
Pete 2 years, 1 month ago.
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@markb Check that the filament exit switch in the extruder isn’t stuck. If you open the Advanced tab in AutoMaker status and look under the Troubleshooting section you will see a readout for each of the limit switches. If the extruder loaded entry is “true” this switch is being jammed by filament, debris, or has failed. If the entry is false, the switch is normal.
The next think to do is to watch the extruder “Index” entry and attempt to install filament. It should switch between true and false, indicating the filament length sensor is acting correctly. If it isn’t, there may be something jamming the extruder sensor wheel or the sensor may be shorting out on the case of the stepper motor behind it.
If either check shows an error, you will need to remove and clean the extruder or add a piece of electrical tape over the exposed contacts on the extruder PCB. You need to get approval and instruction from your support representative before implimenting any fixes like this.
I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben@markb Try something else - First, clip the end of your filament at about 30 degrees - so it isn’t quite flat but is close. Then try to re-feed it. Sometimes the flat or highly angled ends will catch on the filament guide path. If that doesn’t work, remove the locking screw from the bottom of the left side of the case and remove the left side panel. Remove the lower filament guide, it should just pull out, and feed the filament straight into the bottom of the extruder. This will eliminate the possibility of the filament catching or buckling.
If the filament is still not grabbed properly, I will look for another test.
Make sure you don’t touch anything inside the Robox while the power is on and always remove USB and power before doing anything inside the Robox enclosed areas. This may also void your warranty.
I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/benyou can try this in the g-code entry box
g0 e10
it will run the extruder gears pushing filament toward the head 10 units. Press enter a few times and it will keep feeding.
If you run this command while pushing filament gently by hand it might grab it. It wont load as normal but should prove the gears and extruder are working.
use this to feed it back out
g0 e-10
Take care with these commands as they are not speed controlled. It would be possible to damage the head if you feed material against it without the usual controls.
For official support please visit www.cel-robox.com/support/ and create a ticket@markb If your filament loaded value is true without filament being loaded, the filament exit sensor switch is jammed. There is a little plastic flap in the extruder body that the filament pushes on to close the switch. This flap may have taken a set or may be otherwise malfunctioning, or the switch may have failed. There may also be a small piece of filament stuck in the filament path jamming the switch in the closed position and giving that false reading. As long as that switch is closed, the extruder will not take up filament automatically.
It should be a pretty easy fix - pull the extruder out and take the two halves apart. Make sure the filament path is clear and that you can hear the switch click when you press on the sensor flap. If it doesn’t click, take the switch out and make sure it clicks while outside the extruder. If it does, then the problem is the flap is stuck in the wrong position and you will have to gently flex it back into position. If no click, the switch has failed and must be replaced.
I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben@markb Sorry - the terminology is so familiar to me I don’t think about it anymore.
The extruder is the mechanism that grabs the filament off the reel and feeds it to the print head. It is located inside the left side of the Robox under the black side cover.
The part that melts the plastic is called the print head.
You have a piece of filament stuck in your Bowden tube. It looks like the filament broke off just after the feed wheels in the extruder.
You need to get instructions on how to solve it from Robox, but in general to fix it you will need to heat the print head, immediately turn off the Robox, and remove the print head. If you try to do this cold you will damage the print head and the Bowden tube. You may be able to pull the filament straight out at this point. If not, you will need to remove the left side cover and the extruder, then remove the Bowden tube from the extruder. This should expose enough filament to grab it and pull it out of the Bowden tube.
I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben
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