Leaderboard

Keep several things in mind. First i would not build anything smaller then 1.5 pound capacity. Second, the bigger the tubes, passages etc, the longer it will take to heat, and your plastic will just core right thru the center and reduce your capacity dramatically. Anything with square corners is gonna catch glitter etc. Yes I mean don't use any carrier, sandwich the tubes in some aluminum, and heat the aluminum block. Thats about all i am willing to share.

Well explained. But as you said if you mix(stir) while checking temp not much difference. Long time ago I used a probe to stir with and checked it with an infrared and it was the pretty much the same. But my point on the laminate temps, it doesn’t matter what you use as long as it is within 10 deg.

You may want to take you design and idea to your local college and talk to some engineers. You may be pleasantly surprised by what they come up with and also how cost efficient it will be.

Peltier cooler......

How big of molds are you shooting? Your design will yield for very little capacity.

If you want to use a bent tube like so, sandwich in between the plates. Heat the plates not the tube.

I make bass baits and use soft temper stainless .041” diameter wire from McMaster-Carr online. Soft temper wire is malleable enough that you can bend it accurately by hand without a dedicated wire bending tool but plenty strong enough for bass baits. Bend the wire over a nail or drill bit sized for the eye you want and then twist the ends together with vise grips to form a shaft of whatever length you need. I like the ability to cook up screw eyes customized to any bait building purpose.

Maybe this will help out a little... These are ones I have tested and found the fit acceptable.