<p>➀ The author salvages a CNC lathe with irreplaceable faulty ballscrews by purchasing a cost-effective Chinese-made replacement through a UK supplier, though its compatibility with existing hardware posed challenges;</p><p>➁ Prototype 3D-printed bearing blocks and nut blocks were designed to adapt the new ballscrew, exhibiting ±50μm flex under load, prompting further refinement for rigidity;</p><p>➂ A 0.2° misalignment in the 3D printer was resolved through shimming, restoring printing accuracy and reigniting progress in the experimental repair project.</p>