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One could make such a controller with 3D printer parts and building a case for them, but is it significantly less than just buying a compatible low-cost printer. The intent is to heat up the all-metal hot end to tighten the nozzle to the heater break.

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    $\begingroup$ Please clarify. What do you mean to assemble hot ends? Are you talking about preheating the hot end before tightening the nozzle down? $\endgroup$ – user77232 Jan 4 at 15:02
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You can get a suitable board for $20 or so, print a case for a few cents, and either repurpose an old PC power supply or buy a new one just powerful enough for the hotend (not bed) heater very cheap, so I think it's a lot less costly than a cheap printer, and cobsumes less space. But I'm not clear what you need it for.

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