Not shown in that pic is a bunch of kapton tape wrapper around the =20
resistors and aluminum block.  It helped a lot, but it needs just a =20
bit more.  If I can find fire-cement or similar in a small quantity I =20
would try that too, or just build a nichrome-wire head.  But that =20
cement has been the reason for the resistor-heater design.  Think it's =20
time I hit the 3D-printer forums.

Cheers,
-Neil.


Quoting alan.b.pearce@stfc.ac.uk:

> I have had failures on that style of resistor where the magic smoke =20
> came out. I think there was an impulse current not too much higher =20
> than the current required for maximum dissipation.
>
> But looking at the photo of your head, I suspect you could get it a =20
> lot hotter by simply putting some Rockwool or similar insulation =20
> around it. You are going to be losing most of your therms to the =20
> atmosphere, and some simple, but high temperature insulation will =20
> make a world of difference, especially as you say the temperature is =20
> 'almost there'. Personally I would try this before attempting to get =20
> more heat out of the resistors.
>
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