Help printing threads

Filament
1

I’m having issues with printing female threads in ABS. The threads are 25mm x 1.5mm pitch. The male threads are not great, but are completely formed. The female threads on the mating nut are almost non-existent, mostly a bunch of non-adhesed threads. I’ve tried tuning my bridge settings, support settings and print speeds. I’m using a .35mm nozzle. Am I asking too much from this technology? I’m wondering if I should try a smaller nozzle, but really want to know if I’d be chasing my tail trying to get results that are beyond FDM technology.

2

Turn down your retraction.

What can happen when printing the inside of a tube is when the hot end travels then restarts, if it has retracted too much, it will just start with a whisp of plastic which then won’t attach well and you get an octogon or whatever instead of a circle.