Hotend does not keep temperature

General Discussion
1

Basic Information:

Printer Model: AnyCubic i3 Mega with MK4 / 12V Volcano Hotend, 300W 12V Powersupply
MCU / Printerboard: RasperryPi 3+ / Trigorilla 1.0.0 Board
klippy.log
klipper.log (238.7 KB)

Describe your issue:

TLDR: the Hotend does not keep the temperature when using higher flow rates

Hi there, i have updated my Anycubic i3 Mega with an MK4 Direct extruder with Volcano Hotend ( thing:3537449 )

i did that because i want to speed up my prototype prints.

the hotend is attached at the same powersupply as the original was. when i now print with a 0.8 Nozzle with anything over 60mm/s (or around 13mm^3/s). the temperature slowly drops until klipper stops the print because of the temperature loss.

screenrecording

what i did:

  • calibrated extruder motor (rot. distance)
  • calibrated hotend temp
  • calibrated bed temp

I have looked at many many videos and documentations and always people add the hotend to the existing powersupply. Is that correct? did i miss something there?

What can be the Problem here and how would i fix it?

if i can figure out if there is not enough power for the hotend (wich i doubt) is there a possibility to use two heater pins on the mainboard in parallel? currently the heater is attached to Heater0 but there is one spare on available…

Thanks a lot!!!

IMG_3506

2

Do you use the original wires for the heater element? Might be not big enough for the required power. So wires too thin and resistance due to daughter board and additional connections.
And your fan duct seems to point onto the heater block. Looks like it is for the standard hotend.

4 Likes
3

OMG! i totally missed the fan ducts! i was just not thinking about it and just printed it.
as soon as the fan kicked in the temperature dropped very fast.

i changed the extruder cables to a bigger diameter (wich came with the extruder) anyways. you never know :wink:

Thanks a lot for that fast response!

not beautiful… but hopefully it works better :wink: (it was printed in PLA without any fan…)
IMG_3512

1 Like
4

Just imagine what would have happened without the sock on the heater.
Try reprinting the fan duct at least with PETG. PLA might become deformed by the beds temperature already.

5

yes - i just reprinted it with PETG and now i can print :wink:

Thanks for your help!

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