This topic contains 22 replies, has 11 voices, and was last updated by 
BHudson 1 year, 3 months ago.
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I set up my Robox tonight and had a the same problem. ABS failed to stick to the bed and I couldn’t print anything. (0pened a support ticket).
I also tried to extract the ABS and it’s stuck. You can hear the motor running but material will not back out. I can’t find the above Purge Material and Eject Stuck Material commands in Automaker to see if this could help.
Hopefully Robox team is monitoring this forum and it’s a common problem. Please provide a fix so I can get a print done. This is my first experience with 3D printing and I’m almost ready to go back to 2D printing 🙁
I to I’m having the same problem. Now I cannot load a new reel!
@clarckgn @m3pete @ viper
The following are the first troubleshooting steps you should take. You may have already completed one or more.
It is crucial that you clean the PEI bed surface with rubbing (isopropyl) alcohol before printing. I use a microfiber car cleaning cloth on mine to avoid lint. It is also crucial to do the bed and gantry level operations, as well as the nozzle height operation, before printing.
If you have completed all of those operations and you are still having issues with material sticking to the bed, use a thinner piece of paper under the nozzle and redo the nozzle height calibration. The nozzle height test should be such that you can still feel the paper rub against the nozzle. There should be the slightest touch of resistance between the nozzle and paper. If you can’t push the paper under the nozzle, that is too tight, if the paper pulls from under the nozzle without resistance, that is too loose. I use a piece of 30 weight parchment that is sold for calligraphy and get very good repeatable results.
When you are loading new filament, please make sure that the end of the filament is cut at 45 degrees.
For the failure to eject, please check it this way:
Turn off the Robox and unplug all the cables. Remove the head using the screw at the back of the head carrier. Pull the head down and forward to release it once the screw is loose. Clip the filament so the head can be removed. Now turn the Robox back on and attempt to eject. Watch the filament where it protrudes from the head carrier. If more of it comes out, clip the filament at the entrance to the Robox and repeatedly eject until the filament can be pulled from the head carrier by hand. Please report this behavior on the Robox support portal.
If it moves backward, don’t clip the filament and just eject normally, repeating the command until the filament can be pulled from the pathway.
A bit of force is required to release the filament from its pathways going both forward and backward, probably 2-5 pounds of pulling force.
I hope this isn’t a common problem, but I have the same issue right now with not being able to eject. @pete is working on it with me.
I operate two Betas and one 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/benBHudson, see my post in Tech Support/Filament Stopped Feeding
Terry Taylor
@n6mon, it maybe more than just letting the head heat . . . heating the head is obviously required to eject the filament if the previous print didn’t fully finish . .. a fully completed print or purge cycle should park the filament away from the head (beds moves to the rear and waits for the head to cool to ~140deg, then pulls the filament back from the head & then bed moves to the front).
Hopefully its just that causing issues with the other backers, but it appears that the filament can bulge sometimes just infront of the head, making it difficult to retract back through the system. On the odd occasion its happened with me I’ve just removed the head (with all power off - very important so you don’t fry the head) powered back on again and moved the filament forwards a couple 100 clicks. trim the filament 1/2″ from the Bowden outlet, and then been able to eject it successfully. think its mainly occurred when the head’s not ejecting material for one reason or another, I’m guessing the warmth has plasticised the filament and as the extruder’s still applying pressure its just bulged.
Rob, that was my original thought, but I took the head off and the tube that brings filament to the head is clear (I was able to insert a piece of filament from the head-end back towards the device that pulls it and was able to insert about 8″ of filament, so the blockage is definitely at the feed mechanism on the left side.
Terry Taylor
To disassemble the head enough to clear that would be a total strip-down… I really wouldn’t even consider doing that unless recommended by CEL, and that’d probably be only as a last resort.
I’d recommend getting some extra-fine needle-nosed pliers (as used in jewellery-making) and try again to remove that while the head’s hot. You should be able to get some that’ll fit in the hole, and they’ll have a lot more pulling power than tweezers. It might take a number of goes though.
@clarkegn. If you heat up a needle and carefully push it into the center of the filament (not too deep). Let the needle cool for a minute or two then it may pull out.
That’s a great idea!
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