Sturdy Brick Mould
From A Wiki in the Desert
An Improved Brick Rack is a building for making bricks, wet firebricks, and wet clay bricks. It is a superior version of the Flimsy Brick Rack as it has twice the capacity and never falls apart. Improved Brick Racks are built with nails and must be built inside a Compound.
Source
This building becomes available once you've learned the Improved Brick Rack Construction Tech.
Cost
Built in a Compound. Uses 5x5 cells.
An Improved Brick Rack does not wear out, unlike a Flimsy Brick Rack.