Firmware 1.18 provisional change list
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With firmware 1.17 in the Release Candidate phase, I am already planning firmware 1.18. With the firmware getting so complicated, I am looking for features I can remove as well as features to add or improve. The provisional change list is:
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Simpler heater tuning process which avoids the need to second-guess the PWM and calculates the model parameters with the print cooling fan both on and off.
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Add feed forward term to temperature control to better maintain hot end temperature when the print cooling fan is turned on or its speed is changed. Possibly add a feed forward term to compensate for extrusion rate too - are there any Volcano users who could test this?
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Support the Ethernet version of the Duet WiFi that is under development.
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Add babystepping support.
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Remove option to set bed probe points using M557 with P parameter. You can use a bed.g file instead if you are currently using them.
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Remove temperature coefficient option from Z probe trigger height. It was added to better support ultrasonic height sensors, but I don't think anyone is still using them.
I will consider making other small changes at the same time. Projected release date is mid to late January.
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My two cents to "Remove temperature coefficient option from Z probe trigger height":
This can also be interesting for inductive sensors IMHO. And I think a lot of people use them. Though a temp relation formula or sheet is not available to the cheap Chinese probes… -
Can I ask for a backup option?
Full zip of the system that then can be downloaded? -
I've got a volcano, whats up?
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Lykle - That is probably something we will ask ChrisHamm to put in the WebInterface
Nyl0cke ??
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- Add feed forward term to temperature control to better maintain hot end temperature when the print cooling fan is turned on or its speed is changed. Possibly add a feed forward term to compensate for extrusion rate too - are there any Volcano users who could test this?
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ahh missed that!
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I have a volcano, 40 watt heater and high volume / pressure fan. So I can test whatever you'd like. I know I see a +/- 2-3 degree spread on my volcano at times, so would certainly appreciate that.
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I have a volcano, 40 watt heater and high volume / pressure fan. So I can test whatever you'd like. I know I see a +/- 2-3 degree spread on my volcano at times, so would certainly appreciate that.
Thanks! To start with, please heat up your hot end until the temperature is stable. Then extrude filament through the volcano nozzle at the maximum rate you are ever likely to while printing, for about 30 seconds, while monitoring the hot end temperature. Continue monitoring it after you stop extrusion. I'm interested in how much the temperature drops when you start extrusion, and overshoots when you stop, to see if it is worth adding a feedforward term.
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Results will be here in about 10 minutes when it's done uploading.
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Thanks, looks like the under/overshoot is about 2C.
Are you using 1.75mm or 3mm filament? If it's 1.75mm, are you able to extrude at 10mm/sec or greater when using a large nozzle on the Volcano?
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Ability to update PanelDue firmware from Webcontrol
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1.75mm filament.
How large of a nozzle do you want to try? I can go from .4 up to 1.2mm.
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Will try out the 1.2 and let you know.
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What I am thinking is that if you print with a 1.2mm nozzle at e.g. 0.6 mm layer height and 1.5mm extrusion width, then at 100mm/sec printing speed the extrusion rate for 1.75 mm filament would be about 1.5 X 0.6 X 100 / (1.75 X 1.75 X pi / 4) which is about 37 mm/sec. Maybe you can't reach this extrusion rate, but even 50mm/sec printing speed would need nearly 20mm/sec. Melting filament at this rate may cause a significant drop in nozzle temperature, which is why adding a feed forward term may be worthwhile.
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Sounds like you should have a 3mm volcano.
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We are at the limits of what the extruder can do here. 25mm/s is definitely too fast, 20mm/s still has few stepper skips. But for the purpose of this testing, we should be good. Don't mind the snapping sound, that's another issue I've brought up with E3D, I believe it's the bearings or binding in the driven gear assembly.
1.2mm nozzle - 1.75mm filament - 300mm extrudes at 1500mm and 1200mm feedrates with the fan at %50 and %0.
https://www.youtube.com/watch?v=1P9KXk67aPk1.2mm nozzle - 1.75mm filament - 900mm extrudes at 1200mm feedrates with the fan at %50 and %0.
https://www.youtube.com/watch?v=yADr5m_hg9M -
Chris - Off topic: in watching these videos I saw a lot more of your YouTube channel. I find it hard to not sit and watch my printers printing, now I get to sit and watch your printer as well - live!
Are you using Octoprint just for the video streaming or for control as well? if the printer on the stream running a Duet? Sorry forall the questions, just about to share this and want to be accurate.
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Hey, glad I could help feed the addiction or bring the zen as it were.
I need to update my description as I've shifted away from Octoprint and now use just the Duet Web interface for all the on screen stats and job control. I do like Octoprint's G-Code preview and being able to display that, but with the recent OBS changes and inclusion of the browser plugin, I have a single browser session for DWC in OBS that I carve up into the on-screen display you see in the stream. Prior to switching though, I used Octoprint for the onscreen stats, so if you go back a few months you will see Octoprint used to control my RAMPs setup and for a while the DuetWifi.
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Thanks, Chris! Looks like you are getting about 8C temperature drop when you start extruding, and 8C or 6C overshoot when you stop depending on whether the fan is off or on. Definitely worth adding a feedforward term if any one wants to print at those sort f speeds with a Volcano.
Your temperature indication looks rather jittery. Are you using a thermistor, thermocouple, or PT100?
