铅笔笔帽Pencil eraser

修改了原来的短铅笔辅助工具，改为铅笔笔帽，打印之后可以套在铅笔尖端一头，防止铅笔笔尖被弄断，也避免被弄伤。分为两部分，开始部分是挖了和铅笔六边形严丝合缝的结构，后面部分是中间挖了小圆，方便笔尖推入。默认用tpu打印，日常材料petg和pla也可。

The original short pencil assistant tool has been modified to a pencil cap, which can be placed on the tip of the pencil after printing to prevent the pencil tip from being broken and to avoid injury. It is divided into two parts. The first part has a structure that fits snugly with the hexagonal shape of a pencil, while the latter part has a small circle dug in the middle for easy insertion of the pen tip. By default, TPU printing is used, and everyday materials such as PETG and PLA are also acceptable.