There are pictures of a similar technique in this paper: https://www.osti.gov/servlets/purl/1808415 https://www.osti.gov/servlets/purl/1808415 It was done with

There are pictures of a similar technique in this paper: https://www.osti.gov/servlets/purl/1808415 https://www.osti.gov/servlets/purl/1808415 It was done with manually-written gcode though.