For people low on weapon parts, consider dumping motes into your blues. The economy nerfs reduced the efficiency of this, but it's still worth it.
I'm sure someone will come out with a guide to maximize returns since the most recent patch, but I'll give you something quick and dirty that seems to be accurate for me so far (fairly small sample size so take with a grain of salt). Again, this is not optimized or anything, just simple:
3 motes returns 1 for heavy and special
9 motes returns 1 for primary
9 motes returns 1 for every other slot
So, if you can amass some blues (special and heavy will be the bottleneck here), this is a very quick way to maximize your returns by using multiples of 3.
Let's do one example where you have stockpiled three unique pieces of blue armor (or ghost or artifact), 1 primary, 3 special, and 3 heavy. Use 3 motes, switch out your special and heavy, then repeat that process twice for a total use of 9 motes.
Now dismantle everything - you will have used 9 motes and you will return 10 (3 special, 3 heavy, 1 primary, and 3 from your other slots). Thus, you've lost nothing despite not optimizing the amount of slots or the motes put in, and yet you still increase the weapon parts you return from dismantling by 7 (double), same for armor parts, and you will get more glimmer. If you just care about weapon parts but only have a few blues, you can still use the process to double your parts return with a smaller loss of motes (for instance, using weapons only in the above example would result in a loss of only 2 motes).
It sounds complicated, but it's really not once you do the process a few times, and it's definitely worth it.
EDIT: Seems special is inconsistent. Worked for me first 4 times, but not the last 2. I'd change the above analysis to dump in 9 motes to special to guarantee a return there (resulting in a net loss of 1), but the idea is the same.
