All I've done to get this result is to draw that exact shape in #Rhino3D, use the SaveAsSVG plugin to export it, manually copy the d="..." string to both the "board" and "silkscreen" sections in the PCB-ready SVG.

...With one extra step - I altered the "viewBox", "height" and "width" fields to get it to display fully in Fritzing - otherwise it cropped it to the same 40x20 rectangle from the first test. JLC probably doesn't care about those values, so setting them liberally might be a solution.

Modeling something like this is simpler than you think. I use #Rhino3D and a plugin called BoltGen to generate an M20x50 thread (with a 2.5mm pitch), shoved an inverted truncated cone on top, and messed around with subtracting bits from the top until it looked about right.

The 20mm width is mainly to make it print reliably - something this tall but less wide would be more likely to break off mid-print, and I didn't want to spend time reprinting a joke.

I think I've entered a new phase with my #PCB design skills. Being able to sketch the layout in #Rhino3D where I'm relatively skilled, then export as SVG and then just line up the handful of actual components just so in Fritzing has been great.

Today I've discovered the existence of "single line" or "single stroke" fonts - apparently used in engraving, but also useful for text on PCBs. The one I'm using here is "MecSoft" from the Rhino people themselves: https://wiki.mcneel.com/rhino/engravingfonts