These folded pens are similar in function to the Ruling Writer but feature thinner, sharper edges.
DIY FOLDED RULING PEN - Homemade Pop Can Ruling Pen
Hand made folded pen (colapen) for expressive calligraphy fr - Inspire Uplift
Folded Ruling Pen Adventures by Carol DuBosch – Not Just A Card
Ruling Pen by Brody Neuenschwander Linierfeder von Handwritmic – Federfuehrend Kalligraphie und Handschrift
Tim's Folded Pen, Mini Radius - John Neal Books
Hand made folded pen (colapen) for expressive calligraphy fr - Inspire Uplift
How to Do Ruling Pen Calligraphy - Calligrascape
Hand made ruling pen for expressive calligraphy from stainle - Inspire Uplift
Folded ruling pen, Pens and Nibs
How to make a Folded Pen - Winterbird
Disciplined Freedom: Mastering the Ruling Pen – Write on the Edge
Quick Guide: How to use a Ruling Pen — Jeea Mirza
Tim's folded pen; long dagger nib with long penholder
Ruling Pen for Procreate! (2019)
How To Make A Calligraphy Pen At Home (2022)