My first workshop post is a fluid dispenser, has all the liquids in the game and keeps lava liquid inside it, costs 100 coins too, which is neat.

Blocklabs Fluid Dispenser
When standing between the fence pieces you can just harvest straight into the liquid without hitting any blocks behind it for mass harvesting. When harvesting the lava, its best to close the door behind you in case you built it in a cold area, the lava is 2x2 thick so be careful about harvesting it.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1146139305