Topic: Toolmarks on 3D printed pistol frame

[kgarrison]

Inspired by the recent 2022 AFTE presentation: Identification of Toolmarks Present on Additive Manufactured Components
By Corey Scott

I looked for some of these markings on a 3D printed pistol frame I received in casework. This photo is from two casts I took of the bottom of the trigger guard. I phased on a start/stop mark on the far side of the casts, then shifted the left cast over a few layers to see if the marks repeated with the photo'd results. Toward the left of the frame you can see the semi-circular marks which I'm assuming is from the nozzle as it starts to extrude the layers of the curved trigger guard.

Also attached is a photo of the trigger guard area. You can see several of the donut shaped start/stop areas from the nozzle in this photo.