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.
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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??