This is a holster for the Leatherman Arc, designed to work with an Ulti Clip 3+. Prints pretty easily standing up on the small flat bottom, with organic supports on the front and sides. Seen here in carbon infused PC.

While other holsters exist, I didn't like the belt/pocket attachment mechanisms, and didn't like the open frame designs. I didn't trust that my expensive tool would stay attached to my waist. 

This holster has excellent retention, and a smooth click at the bottom. It requires removing the pocket clip, but that's kind of the point, right? If you choose to go a different route for attachment, I have included the .STEP file to modify this.

Basic dimensions derived from PractiPrint's open frame design.