Argh finally someone tries the obvious solution. I was already considering it but was demotivated since it seemed so obvious and nobody seemed to have done it before.

This device could also probably be printed in PLA. I can’t wait until I get my lab power supply so I can give this a try with a wire coil heater.

Edit: you could even mount some PTFE tubing mounted below a heated bed and pass air through it. That way you could potentially get away without a heating element and re-use some power usually lost.