This is a horn guide for oriental chisels.
It's impossible to work with a normal chisel, so it's to design and reveal it.
You shouldn't make it and sell it. We allow you to make it and donate it free of charge.
https://blog.naver.com/dimosoft/223304557117
https://blog.naver.com/dimosoft/223325676641
https://blog.naver.com/dimosoft/223331349053
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.