When drawing an engineering drawing, the designer needs to prepare at least three pencils of different types and thicknesses in order to complete an engineering drawing. This pencil sharpener adopts the shape of a regular tetrahedron and uses a simple pure physical structure, so that all four sides can complete the pencil cutting work and are very interesting.
本作品版权归 最爱打瞌睡 所有,禁止匿名转载及个人使用,任何商业用途均需联系原作者。
新用户?创建账号
登录 重置密码请输入电子邮件以重置密码。
More than three years have passed, I just want to ask, has it been mass produced?
This four-way tube works very well.
Don't leave a place for the structural engineer at all... the mold factory is crazy.
The idea is very good.
Is it easy to block pen crumbs??