V1.2 Owjo's Printers by Owain

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • Owjos Printers <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Owjos Printers/
  • ADDING ENTITYS TO F4.txt
  • garrysmods.json
  • INSTALL & INFO.txt
  • License.txt
  • owjosprintersv1_2/
    • lua/
      • autorun/
        • bootup.lua
      • entities/
        • eight_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • five_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • four_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • one_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • seven_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • six_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • three_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
        • two_printer/
          • cl_init.lua
          • init.lua
          • shared.lua
      • owjoprinter_config.lua

-<FPS>-Camiron, big Cheese, c0w0navirus, [FR] TheShady, Team_Gaming, the overlord, Dr. Death, TheGamingCailan, MrBullet | IFN.GG, SquadExha, SHIRONE, Opie Taylor, Minato Johnson, Space Cat™, KMA, Glizzy atmc.cc, andhalo, iliminateur, tangoçame, ~r~CO-88|Jake, Medovik, KraiZzON, cryption, Duck, Xjay32, Ionut586, ✿ℤ, Impostor johnyap1, progxd1, ivatinrechak, TeNtE, Pipspy, Kirito, F.O.X.Y, [LOS]DönaTela!, kirito, Berke, Négatif, Glophop, T.pap, Max, Mr. Burger, jevousaimepas, CrazyMaksimus, DoggoDev, Meattekn, NaylikLeGamer, Itachi Ushiwa, ~r~ [SEAL] ~b~ E-3 (SN) Jac M, ●•╚╣Ύ╔╗å ╚╣Ύ +2122 others