<p>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.</p>
<p>I use PLA and have been using the speed and nozzle (0.4 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 &quot;U&quot; shape (extrusion of .5 mm Is the “cutting edge”. I started getting some weird bubbles too and am not sure what has created that either (see pic).</p>
<p>I use Fusion 360 to make the cookie/clay cutter and then send it to Ultimaker Cura to slice.</p>
<p>Any help with how to make it sharper and more clean cuts would be great!</p>
<p><a href="https://i.stack.imgur.com/0uMjD.jpg" rel="nofollow noreferrer" title="Cookie/clay cutter form"><img src="https://i.stack.imgur.com/0uMjD.jpg" alt="Cookie/clay cutter form" title="Cookie/clay cutter form" /></a></p>

An extrusion width of 0.5 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.