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Posted (edited) · Left extruder printing problem

Hi, 

 

The printer: UM3 extended, latest stable firmware, Cura 4.3 and 5.9 confirmed issue. 
 

I have the following problem: printing using extruder 1 results is very thin not connecting lines. See the picture, left is extruder 1, right is extruder 2. Same settings, initial layer height etc. Just switch model from left to right. 
 

I’m not 100% sure, but I think this started around the time I replaced the bowden tubes about a few weeks back. Was long overdue as the inside was worn out. 
 

First I thought it was a levelling issue and first layer height but intermittedly throughout the print it goes wrong too. As if the fillament is struggling to come out. But the initial prime before a print goes ok. 
 

I’ve re-levelled the bed, switched the printcores around, cleaned the feeders by opening them up, new bowden tube's and those connectors to the print head and feeder on the tubes, switched the fillament around, done a hot pull of the nozzle to see if there is blocking, increased the print temp a lot to see if there is better flow, tried different Cura versions as I thought it might be a print setting. No special gcode added for the left (nor the right extruder), no starting code and pretty sure all cure settings are identical between left and right. Also happens for both fast 0.2 height as fine 0.1 height profiles. 
 

I’m about to test if it happens for a 0.8 nozzle too. 
 

Other 2 pics show printing as a much increased print temp, where the first layer of the model seems ok (brim was still marginal ok) but a top layer in the model is still bad again. 
 

I am printing on a PEX bed too, don’t think that matters as printing from extruder 2 works fine with that. 
 

I’m at a loss and don’t know what to try next. 
 

All suggestions are welcome! 
 

Update: I can confirm now there is no problem with the Fast 0.2 profile and the 0.8 nozzle and also the 0.25 nozzle and fine profile seem to be printing without issues. That rules out that filament, extruder, bowden or spool. 
 

I recon the only thing which can cause this now are the left extruder profile settings for a 0.4 nozzle. I will confirm to print with the right extruder set in the left side if it really isn’t something with that nozzle. 
 

Cheers,

 

Richard
 

 

 

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Edited by rhoogenboom
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