I was considering ordering a 3D-printing pen to use as a small PLA spot welder when I laid eyes on my cheap desktop glue gun. A glue gun had everything I needed: good ergonomics, good tip ...

A turbulent air assist can make scorch marks worse, not better. 3D-printed nozzle to promote laminar air flow on the left, stock nozzle on the right. As an experiment to improve the quality of the ...