This topic contains 8 replies, has 2 voices, and was last updated by 
irawans 2 days, 15 hours ago.
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I have been printing with filaments from Polymakr (PolyWood, PolyPlus, and PolyMax) and T-Glase (all Colour) with success . Even I could say I’ve got better result than Filaments from Robox. Yesterday I printed a Vase from http://www.thingiverse.com/thing:104694 It has been printing with excellent result, until about 90% and suddenly the flow of the filament did not come out smoothly. I have experienced with PLA that suddenly stop flowing from Robox’s filaments.
Note for the pictures below:
1. This is the part where filaments did not flow smoothly.
2. From no 2 below, it printed excellent. Note: I did not do the cleaning, it just come out from the printer.
3. Strange, there are 2 bridges there which they are not supposed to be there. I think it is Slic3r mistake. Am I correct ? What do you thing ?
4. After I saw the result, I tried to Purge the filament, and it seems that the filament randomly stop flowing at 0.3mm nozzle. On the last line (no 5), it backs to normal.
Note: Printed with: Fine quality, and I just edit a bit: Fill Density:0, Fill Pattern:Line, Solid Top:0
I’ll venture my guesses there:
1. I had similar trying Maker Magazine test- for strange reason one layer thick walls had similar gaps. Probably extruder was slipping and not pushing enough material. Definitively not filament multiplier.
3. I’ve noticed similar at the first layer. It might be Slic3r or just Robox not closing valves properly. It usually happens at the base for me…
4. Did you try to repeat it?
@clicky No, I did not. I just turn it off, because have to go work. To night will try again. But I guess it might be different condition, does it ?
Oh, when I said repeat - I meant purge! If on repeat purge all seems neat then it might have been some kind of glitch. If it is sill inconsistent, then it is some kind of sign.
Ah, something just occurred to me: when I tried to reproduce Pete’s neat top finish (with gaps!) of 9V battery cover, I played with filament_multiplier lowering it up to 60-70%. Mini purge before print started acting weirdly: instead of having result of purge nicely flicked away from wipe it (almost like a ball of filament) stayed on the nozzle and got dragged with the head. The moment I increased amount pushed back to head it stopped doing so.
Since you have gaps in print and purge which struggled at the beginning to push enough material - what if extruder slips on this particular type of filament? There was an option for printer to count how much filament it delivered and if failed to account for all it wanted to deliver it would stop. Option was a threshold when it stops. It would be nice for someone from CEL to remember about it and let us know if you can ‘read’ the number (or difference or something) and see how much it slipped. That would be good way to prove my theory what happened to your print.
@clicky. When I arrive home I will do the purge again. Do you think it will be the same condition if I did it before I turn it off ?
My current working theory (which might be completely wrong) is that your filament is slipping. Changing filament might make it completely different. I think I had similar issue with CEL’s Polar White PLA, but not any other ABSes.
Out of curiosity - did purgers with other materials look similar to this one?
@clicky, Actually every time before I print I always purge the filament, and they look normal. But what you said remind me that occasionally the filaments slip. I could hear the sound. But the result still good. May be I am just lucky, and not this one. If the slipping filament is the reason, so it is the filament fault or the Robox hardware ?
One thing is, I manage to auto feed once, when I start using Robox at first time. Other than that, I have to purge the filament in order Robox to pull the filament to the head. I have submit a ticket, but no reply yet from Robox.
So, I assume that mostly it has issue with the Robox Hardware some where inside. am I right ?
Huh. I really don’t know. Maybe both. Maybe just slippery filament? (PLA for me, looks much shinier than ABS so it could contribute to slipping). So far I didn’t have issues with slipping filament. Not much. I did hear the sound you explained but that was because of PLA + slightly entangled spool (poorly wound spool). I had two or three occasions where printer just stopped mid printing with flashing light and I really hope it was just slipped filament, not something else. (at least once with ABS)
Otherwise, nothing. Except that test print: http://www.cel-robox.com/forums/topic/make-magazine-release-their-test-models/page/3/#post-9648
@clicky, thank you for the info. I have experienced 3 times when the filament stop flowing and all from PLA, but No flashing light. Robox still printing and moving but no filament flowing.
About, the Make Magazine Test, It is interesting topic. Planning to print those test this weekend.
Thank you.
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