[feature] Adaptive / Feedforward Temperature setpoint
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@Adrian52 you could plot it with BtnCmd if its in the object model
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@Adrian52 Wouln't you need to repeat the same print (with/without silicon sock) to properly quantify the effect? What are you comparing to?
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@Triet Indeed - I was just looking at the feasibility of leaving off the sock. I was concerned that it would make temperature control unstable, but this doesn't seem to be the case. I thought a next step would be to plot the boosted temperature against the actual temperature, but waiting for an update that has the boosted temperature in the OM. On a learning curve with btncmd too - not used it before. Will aim to do a more formal comparison, including maximum speed and print quality.
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@Adrian52 I share the same interest. If I get somewhere customizing DWC to show the temperature deviation I will post my findings.
By the way, removing the silicon sock to facilitate better temperature control is a brilliant idea.
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@Triet said in [feature] Adaptive / Feedforward Temperature setpoint:
By the way, removing the silicon sock to facilitate better temperature control is a brilliant idea.
Even better would be to replace the hot end by one with much lower thermal mass and heating/cooling times, such as the E3D Revo.
Duet WiFi hardware designer and firmware engineer
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http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 I am in fact using a revo micro on my delta, and just ordered a 60w heater, to see if it shortens the heating time. Hope it doesn't melt my part cooling duct!
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@dc42 The thoroughgoing extrapolation of this idea would be an
INo Trident -
Another experiment, with a 60W e3d revo heater, and no socks. The print is a 20x100mm cube, and a set of 6 8mm diameter cylinders. The cylinders print quite slowly and the cube at 140mm/sec.
This is an excel graph of csv data captured by btncmd (not worked out how to plot calculated values in btncmd).
I added the active temp to the boost (a+b) to compare to the actual temp(current). You can see there is a bit of a lag on both the heating and cooling phases.
I also plot the extrusion volume, and you can see that the boost anticipates the increase in extrusion, although not by enough to align with the current temperature. I plotted extrusion+active temp(e+a) to move the extrusion line up to the area of the current temp line.
Not quite sure why the active +boost is below the current temperature in the initial phase - this is the relatively slow printing of the first layer. -
@Adrian52 If the command would allow an option to limit the extrusion (=speed) to match the actual temperature, it would be much better, as layer adhesion would be optimal. Delamination and sudden breaks under mechanical load would be a thing of the past.
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@dc42 the 60w heater on the revo seems to work fine, albeit with a tendency to overshoot a bit. The heat /cool curve (current) is not too bad, but lags the extrusion /boost curves by about 6 seconds. I tried increasing the queue size to 120, which is probably near the limit for my old duet2wifi. The A parameter at 50 works then. Is there any way to adjust for the lag?
