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

I doubt that just going to the white cement ones will change much for you, =
AFAICT they are the same in the channel in the cement as fed into the insid=
e of the aluminium block and cemented in using similar cement. The Al block=
 will have a lower thermal resistance from element to outside surface. The =
problem you have is that most of the surface of the resistor is not in cont=
act with the part you are attempting to heat, so 75% (roughly) of the resis=
tor surface area is wasting heat for you. It will take somewhat more than a=
 few layers of kapton tape to sort it, although that may give enough therma=
l resistance to show what is really needed.
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