Dupe: Malleable Flesh (Patreon)

1. Get on the Necrolord quest Build-A-Bomination,

https://www.wowhead.com/quest=60041/build-a-bomination

in Maldraxxus.

2. Click on Chordy's spirit next to the questgiver and click on the speech bubble "What type of construct should I build?". 

3. A pile of malleable flesh behind you should now be glowing. This can be looted.

4. Abandon the quest and take it again. This can be done infinitely. 

Malleable flesh is intended mainly for items that have utility whilst in-world, but some of the items you can make with it can be sold on the auction house for gold. For example the pet Mu'dud sells for 8000 gold average across all EU realms.