FST-01 with transparent tube is basically designed for people who want to customize.

Typical example is with the case of MONO eraser .

In 2015, gniibe went 100-yen shop to seek another craftwork possibility.

Since UV resin is available there, gniibe considered about that. But, in the end, gniibe used juto string and a key shape part for craftwork, instead.

Those are good for tamper resistance, too.