E3D Cartridge Reads Thermistor Lower Than Stated Temp
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I can't spot anything amiss with the thermistor settings. I'm wondering if the IR temp gun reading is a "Red Herring" and maybe the Duet displayed temperature is correct. In which case, the reason for the lack of extrusion could simply be a partial blockage in the hot end somewhere.
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I think your thermistor is reading correctly, and you have a different problem. An IR gun won't give accurate results because its target area will be much larger than the heater block. 250C is very high for PLA. What speed are you trying to extrude at? Most extruders can't manage more than 5mm/sec through a 0.4mm nozzle, and 5mm/sec is plenty fast enough for that size nozzle.
0.8 ohms between VSSA and ground is OK. There are a couple of different types of VSSA fuse used on Duets, and one has higher resistance than the other.
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I've been considering the same. I found my thermocouple and placed it between the silicone sock and nozzle and measured 200c when the set temp was 235c but I'm not sure if that difference could be attributed to the probe placment or not. I guess if that reading is suspect for that reason I can remove the nozzle and take a measurement inside the heater block.
Regardless, before I do anything else Ill run some wire through the tip to see if its a partial blockage as you suggested. I kinda hope thats the case at least lol
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I want to say I was extruding at 10mm/sec, so that could be a factor. Ill slow it down to see if that helps with consistent extrusion. It gets through maybe 40mm before it can't go anymore, but once I give it a few seconds it will go a little more then halt again.
Tomorrow ill check for a jam, test extrude at 5mm/sec then measure the temp inside the heater block with the thermocouple. Hopefully that'll do it!
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….............I want to say I was extruding at 10mm/sec, so that could be a factor. ..................
Yes that would likely be it - or certainly a contributory factor. I believe the E3D volcano can melt plastic a bit faster.
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Quick update, I went home for lunch and had time to run a small wire (smallest guitar string works well for .4mm nozzle) to clear out any partial blockages at the tip and test out extruding at 5mm/sec and seems to have helped a little, but just at the tail end of extruding 50mm it stops feeding though. I'll use some polycarbonate filament I have to do a cold pull and see if that will make a bigger difference. I could also check the tension on my idler springs, but those have been set for a while without a problem so they don't seem likely to have tightened up to me, but I could be wrong which seems to be the case as of late!
Just so I have a better idea of what variables I could check for, in addition to the cold pull, does anyone have any suggestions for what to try? I'm using a hobb-goblin shaft and the teeth are cleared of debris and I'm pretty sure the nuts on either end have not cinched the large gear down onto the extruder body since one side is a nylock nut and the other is using some loctite on the regular nut. The drive gears move smoothly by hand without any current applied, so I think that's off the table as a possibility.
Sorry if this has morphed from a hardware thing into a more general issue. Just goes to show that just because I'm setting up new hardware, doesn't mean that any problems I encounter are due to said hardware
The last thing I printed with my Smoothieboard before switching went well so I wasn't expecting the extruder setup to be an issue. -
Even at 5mm/sec, that's 12mm^3/sec which is on the upper end of how fast the v6 can melt polymer.
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Even at 5mm/sec, that's 12mm^3/sec which is on the upper end of how fast the v6 can melt polymer.
Sorry if I wasn't explicit, but I'm primarily using PLA for testing the extruder settings, the PC I mentioned is just to do the cold pull to clear out any debris. In any case, since it seems like my issue is not a Duet related issue, I'll work the problem and search for solutions related to the reframed issue. Thanks for the help guys!
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PLA and PC are both polymers - 12mm^3/sec is on the high end of what a v6 can do.
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PLA and PC are both polymers - 12mm^3/sec is on the high end of what a v6 can do.
In any case it seems to be doing fine. Is there any way to add custom values on the Paneldue for extrude speed? The lowest it will go is 5mm/sec in the interface. Would be nice to add custom values for movments too.
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At present the extruder speeds and movement amounts on PanelDue can't be customised. But you can set up macros for particular operations that you need to perform frequently.
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Are there any plans for making the UI customizable in the future and if so, to what extent? I saw a thread someone where that indicated that you could directly edit the firmware, but I'm sure I'd just bungle something up lol
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I'll probably make it more customisable in future, but the firmware builds for 5" and 7" screens are very tight on memory. So we'll need to move to a chip with more memory before we can add significant functionality to the firmware. This is planned.
