50W heater is unable to keep temperature with fans on

[naive arch]

How likely is it that a 50W heater (from Trianglelabs) is unable to keep the temperature of a Dragon HF heat end, socked, if a model fan is turned on more than 60%? The heater is connected to EBB36, which with its supposed 5A output should have plenty of headroom.

If it is likely, how to fix it? If it is unlikely, what to look for?

[versed glen]

I'm also running a dragon HF hot end, and during high flowrate lines the heater reaches 100% with silicone sock on soooo.

[true vortex]

Which toolhead? Check that extruder max power is set to 1 in the config.
Also do check the resistance of the heater to make sure it's actually 50w.

[naive arch]

@true vortex Stealthburner, max_power is 1.0

Let me check the resistance...

12.4 Omhs, so ≈46W, looks reasonable

I could get a 70W heater of course, but I'd like to ensure I'm not just papering over a problem.

[true vortex]

I usually recommend a minimum of 60w with dragon/SB. The block is big and sits low and depending on ambient/chamber temps and fans it seems to often fail with heaters in the 40W range. Especially as extrusion flow rates increase.

[naive arch]

@true vortex Thanks, that's exactly what I needed to know! I'll give a larger heater a try.

[rustic dirge]

How are things going? did that solve your issue?

[naive arch]

Still haven't tested it — I've been getting rid of X cable chain recently and converting to umbilical. I'll let you know once I have got everything back together and did a thorough testing.

[rustic dirge]

did u had time to test? if so, did that solve it?

[naive arch]

@rustic dirge Finally I got around to rebuild the printhead. Looks good so far. I'll let you know if I have any problems in a week or so.

[rustic dirge]

appreciate the follow up 🙂
fingers crossed and good luck.

[rustic dirge]

its been 22 days. do u have an update for us? 🙂