I do have a design in mind, using an electrical heater, but I haven't bought the heater yet, so I haven't got the size info to design the heater box yet.
You may also want to consider building a smaller version for pulling smaller parts so that you don't waste as much as material for the small stuff. Something like half that size.
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Glad to see the laser cutter is still getting use, too (if I'm parsing the design correctly).