I recently posted a pic of this P. metallica for sexing and the T has molted shortly after. The molt was unfortunately ripped where the spermatheca might be (not that I have the tools to magnify the molt enough). Tried using the macro lens on my phone for a closer image.
I do not know if this sling is still too small to sext and how difficult ventral sexing is with P. metallica... It grows insanely fast (molting almost every month) and is a fantastic eater. This is as close as I could get, without the pic becoming blurry.