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PLA profile affecting extruder temperatures
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Description

We need to modify the PLA, Polylite... profiles to turn the fan down on initial layers. The current profiles turn the fan on at 100% when the nozzle is on the first layers. This is causing a refraction of air from our considerable part cooling fan, to blow back on the nozzle and drop the temperature 5 degrees or more. The fan could be set to 50% and then ramped up slowly to 100% when there is less possibility of air affecting the nozzle.
This is necessary for the Mini and Taz, Aero and V3 tool heads.

Event Timeline

karrad assigned this task to anolen.
karrad added subscribers: anolen, karrad.

@anolen Can you check on the polylite profiles with a tool head that is known to have the thermistor fix?

alexei triaged this task as Normal priority.Apr 16 2018, 12:47 PM
alexei changed the edit policy from "Custom Policy" to "Cura LulzBot Edition (Project)".

Sure, Should I use a Hibiscus or gladiola with an Aero?

@anolen Start with the V3 dual extruder, and than on to gladiola. The 40w heater cartridge in hibiscus should be fine to help alleviate this.

I don't think I have a V3 Dual that has had thermistor work recently, I do have Gladiola's that did.

@david.hall Can you get Anolen a working v3, or double check the ones she has?

karrad moved this task from Backlog to Profiles on the Cura LulzBot Edition board.Apr 16 2018, 1:24 PM

Put a V3 Dually (with soldered thermistors) on @anolen desk. this morning. Should be good to use.

@david.hall Thank you kindly sir! 😄

I ran a few dual Poly PLA prints and couldn't get a temperature fluctuation with our profiles. Dual V3 Poly PLA Profile is good for now, moving on to the Taz Aero

I have been doing testing with a Taz 6 Aero. After talking with @karrad he explained that Cura's "Initial Fan Speed"+"%" is always active, it cannot be turned off, so when it says "0%" it is only going to remain there until layer 2 when it calculates the percentage appropriate when taking "Regular Fan Speed" and "Regular Fan Speed at Height/Layer" into account. I have brought down the fan to starting the 2nd layer at 5% and I still get a 6 degree temp drop (same as 15%), my toolhead was indeed soldered. Any Thoughts?

@anolen How long does it take to recover from the drop? A drop is expected, along with a quick recovery

It recovered in less than 8 seconds, didnt seem to be causing any print issues either.

@anolen Try a couple larger prints, and see how it is affected.

Hello, Has there been any recent changes to V3 profiling?

@kforrest Last time profiles were changed, was june 18th but it was just a name update on T2173. We have also added in some experimental profiles, but we have not changed the existing settings.

karrad closed this task as Resolved.Sep 21 2018, 7:43 AM

@anolen Re-reading this ticket, it looks to be resolved with no print drop issues. Going to close out, please re-open if you think it is necessary