@ancientjames Maybe it was drilling a hole :P
(Were there maybe some non-FDM-appropriate codes in the result?)
@ancientjames I would expect a viewer for fdm to simply ignore e.g. spindle on/off commands, and if chatgpt was borrowing from some g-code for milling/boring/... going up and down might not be that silly.
@robryk It looked valid, just not useful. (I looked at the result in a viewer rather than sending it to a machine...)