This is a model of a Roman-style wall with a wood roof and with stone steps. Also included is a gate, a straight-line tower and a corner tower with a tile roof. An option above the gate or the towers is to add a firing platform for archers, scorpions or ballistae, also with optional wood roof.
The files should be printed at 100% size if you want to use the model with 1:72 scale figures. If you disagree, just set the printout to a larger size: this will take longer but it will give you those more imperial dimensions.
This wall-and-gate combination can be used to display walls across a very long time period. The attached pictures show how it works with a set of 1:72 scale Late Roman era Huns and Alans from 400 AD and also with a Medieval English Archer dating 1000 years later. At 1:144 scale, larger projects become possible such as frontier walls and towers of indefinite length, or a complete self-enclosed castellum.
The main gate file contains two separate hinged gate doors, two smaller doors for the upper level, and an iron grate. You can hang the iron grate through the opening in the floor in a raised position by attaching it to two pegs on the inside wall.
I have made the door elements a bit chunkier than real doors to also allow printing out at a smaller 1:144 scale.
My guide for the roofing above the wall was that a medieval archer with a longbow should be able to draw his bow when standing under it. Originally all roofs were detachable, but that was too fussy to print out and assemble. If you prefer the wall or the gate platform without a wooden roof, just print out that file instead.
I printed the examples in the pictures using PLA with a 0.6mm nozzle on an Ultimaker 2+. The largest file to print out in this scale is the gate file, which takes ca 13 hours. Settings: 5x top and 5x bottom layers, wall line count=3, infill density 10%, normal 0.15mm layer height. Please use a raft for the separate door and grate elements. No other supports are needed.
If you prefer 1:144 scale, reduce to 50% for a much faster printout. Alternatively, 1:56 heroic scale would require a 128% scale setting and takes longer. Enjoy !