Saw a guy on reddit who bred 2 tek parasaurs constantly and when the babies died he would farm them for dust and scrap metal. Ruthless, but efficient

Forbidden fun dip

When you are in the Extinction Map: Hit the Lamps, benches and Tables in the City with a Doedi. You get a lot of dust! Easy way to get Full Tech Armor.

Take a good doed to extinction stay in sanctuary and attack every light poll and bench you see they pay out heavy in dust, electronics and crystal

Just vandalise the local benches tables and lamps in extinction to get easy element dust.

You can also get element dust from tek dinos

You can breed tek animals and kill the babies with a chainsaw and bam your farming element dust

Goodluck

All bionic Dino variants work as well to drop. I recommend using tek parasaurs for easy farming

Defense units can also drop this