QA: Keeping Print Layer Lines off the Casting
问答：3D 打印母版的层纹怎么不带到铸件上
标签：层纹,二次固化,底漆,层厚,铸件表面
层纹带入铸件多因三点：层厚过大（应选 0.03 mm 以下）、二次固化过度导致翘曲、未喷底漆封闭。正确顺序：405 nm 固化至表面不再发黏（10–15 分钟，勿超 20 分钟），800 目水砂轻磨后喷 2 遍细底漆，干燥 2 小时再翻模。铸件表面只需轻抛即可消除残余台阶。
Layer lines usually come from excessive layer height (use 0.03 mm or finer), over-curing that warps the part, or skipping primer. Cure under 405 nm only until the surface is no longer tacky (10–15 min, never over 20), light-sand with 800-grit wet paper, spray two fine primer coats, and dry 2 h before moulding. A light polish on the final casting removes any residual steps.