Valve Stem Cap w/ a D

In my slicer (Slic3r) it works, but i'm not sure it if will work for others. if your slicer shows the bottom layer as solid (no hole to screw on) try cutting off the bottom few layers in your slicer

I made 2 shorter ones, one with a slight curve because why not

the 2 example gray short ones were printed with .2mm layers and the pink one was .15mm

the shorter ones don't print perfectly and sometimes you have to reload them in your slicer to make them print correctly, just print them in black and who the hell cares am I right?