It is an improved version of the homebrew mapping pen that was published earlier.
We have improved the concentration because we received inquiries to the effect that the concentration would be thinner when used in color layers and Grescelayer.
以前公開した自作丸ペンの改良版です。
カラーレイヤーやグレスケレイヤーで使用時に濃度が薄くなる旨の問い合わせを頂いたため濃度を改良しました。
Pentax ペン
Old version