On Saturday, August 23, 2014 9:07:06 AM UTC-7, Avery wrote:
-- Exactly- meaning people expect a lot more. The same goes for CNC-ed parts, like heater blocks. Cast, they would be cheap per unit, but it is hard to get get the volume to justify getting a mold made.
Field's metal (named after Simon here!) melts at 62 °C (144 °F). Why don't we just suspend PCR tubes in a puddle of liquid metal, mounted directly on top of a Petier cooler? No CNC required, and you'd get zero air gap.
Field's metal is a bit pricey because of its high Indium content, but there are some other low-melt alloys that are much cheaper. This non-toxic Bismuth/Tin alloy melts at 138 °C (281 °F), not much above autoclaving temperature. You may be able to mold a PCR heater block by simply sticking PCR tubes into the molten metal.
Patrik
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