How to sharpen cookie/clay cutter edge I’m new to 3D printing and have the Creality Ender 3 Pro. I work a lot with clay for earrings and wanted to design my own cutters with a sharp edge to create clean shapes. 

I use PLA and have been using the speed and nozzle (0.4&nbsp;mm) that was already set when I bought it. It’s been creating fine edges but I’d like to make it a lot sharper. Using the instructions from videos I saw online, I created the following u shape (extrusion of .5&nbsp;mm Is the “cutting edge”. I started getting some weird bubbles too and am not sure what has created that either (see pic). 

I use fusion 360 to make the cookie/clay cutter and then send it to Ultimaker Cura to slice.

Any help with how to make it sharper and more clean cuts would be great!
An extrusion width of 0.5&nbsp;mm is too wide for making a sharp outline, I do use this sometimes for extrusion width for the infill.

Note that you can sand plastic (e.g. PLA or ABS) to sharpen the edge.