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Retractable Ballpoint Pen - Thinner
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原版太粗了,握着不舒服,缩小了到了80%并且加深了旋转的螺纹,但是打印的弹簧极易失败,请使用更加有韧性的材料进行打印,笔尖的孔可能略小根据自己打印机公差自行调整孔洞补偿
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