First version is out!

LICENSE.txt

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+3d_printer Copyright (C) 2021 Cosmos
+
+3d_printer mod by Cosmos- Adds a 3d_printer, a battery, and a blueprint registering api to Minetest.
+
+DISCLAIMER: This software is free, and will always be free. If you paid anything for obtaining this software, you have been bamboozled!
+=====================================================================
+
+All code provided in this package is is licensed under LGPL-2.1
+Full license: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
+
+All textures and models provided in this package are licensed under CC-BY-SA-4.0
+Full license: https://creativecommons.org/licenses/by-sa/4.0/legalcode

README.md

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+3D Printer mod [v1.0] by Cosmos
+==========================
+This mod adds a 3D printer, which allows you to craft items only using plastic sheet, as long as you have a blueprint of the item and enough battery.
+
+To use a 3D printer, insert a blueprint, a charged battery, and the exact plastic sheet count required.
+After that, punch the printer and check it's inventory, the item output will be in the plastic input.
+---------------------------------------------
+See: license.txt for license.
+
+Check out api.txt if you want to create your own blueprints.
+
+Check crafting.txt to see crafting info.
+---------------------------------------------
+Depends on: default, dye, basic_materials.
+---------------------------------------------
+
+==HOW TO INSTALL THE MOD==
+1.Download the mod, it may be a ZIP file.
+2. Extract the folder inside to somewhere on the computer (if its a ZIP file).
+3.Make sure that when you open the folder, you can directly find "README.md" in the listing. If you just see another folder, move that folder up one level and delete the old one.
+4.Rename the folder to "3d_printer" incase it has another name.
+5.Move the mod to "minetest/mods/" or "~/.minetest/mods/".
+6.Here we go!
+============================

api.txt

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+To register your own blueprint use:
+
+plastic_printer_data.register_blueprint(item, description, cost, drawing_image)
+
+See the example below:
+
+plastic_printer_data.register_blueprint("foomod:foobar", "Foo", "5", "foo_bar.png")
+
+The result will be an item whose name will be "foomod:foobar_blueprint", description will be "Foo blueprint", cost will be "basic_materials:plastic_sheet 5"
+The parameter drawing_image is optional, it overlays the blueprint image. If nil, the item inventory image will be a blank blueprint.
+
+Every parameter filled in the function needs to be a string, except for drawing_image, which can be nil.

crafting.txt

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+3D Printer crafting:
+
+{"basic_materials:plastic_sheet", "basic_materials:plastic_sheet", "basic_materials:plastic_sheet"},
+{"default:steel_ingot", "default:mese_crystal_fragment", "default:steel_ingot"},
+{"basic_materials:gear_steel", "basic_materials:plastic_sheet", "basic_materials:gear_steel"}
+
+-------------------------
+Blank blueprint crafting:
+
+{"default:paper", "default:paper", "default:paper"},
+{"default:paper", "dye:blue", "default:paper"},
+{"default:paper", "default:paper", "default:paper"}
+
+-------------------------
+Battery crafting (shapeless):
+
+{"default:copper_ingot", "default:mese_crystal_fragment"}
+
+NOTE: Batteries can be recicled, place a battery in any crafting slot and it will be transformed into "default:mese_crystal_fragment"
+
+-------------------------
+Any registered blueprint can be crafted using a blank blueprint and the desired item, so you can create copies of an item incase you have plastic
+
+Suggestion for developers: You can use blueprints as a way to unlock items by finding hidden blueprints

depends.txt

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+default
+dye
+basic_materials

description.txt

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+Adds a 3D printer and blueprints to the game

init.lua

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+plastic_printer_data={}
+blueprint_items = {
+price={},
+result={}
+}
+
+--Functions
+local function can_dig(pos, player)--Prevent a loss of items by accident
+	local meta = minetest.get_meta(pos);
+	local inv = meta:get_inventory()
+	if inv:is_empty("main") and inv:is_empty("material") and inv:is_empty("battery") then
+        return true
+    else
+        return false
+    end
+end
+
+local function allow_metadata_inventory_put(pos, listname, index, stack, player)--I would actually only let you put the allowed stuff, but it was lagging and crashing the game
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	if listname == "main" then
+		return stack:get_count()
+	elseif listname == "material" then
+		return stack:get_count()
+	elseif listname == "battery" then
+        return stack:get_count()
+	end
+end
+
+--Nodebox
+local printer_box = {-0.5, -0.5, -0.5, 0.5, -0.42, 0.5}
+local printer_box2 = {-0.45, -0.5, -0.45, -0.4, -0.4, -0.4}
+local printer_box3 = {0.4, -0.5, -0.45, 0.45, -0.4, -0.4}
+local printer_box4 = {-0.45, -0.5, 0.4, -0.4, -0.4, 0.45}
+local printer_box5 = {0.4, -0.5, 0.4, 0.45, -0.4, 0.45}
+local printer_bar1 = {-0.43, -0.5, 0.4, -0.4, 0.5, 0.43}
+local printer_bar2 = {0.4, -0.5, 0.4, 0.43, 0.5, 0.43}
+local printer_bar3 = {-0.43, -0.5, -0.43, -0.4, 0.5, -0.4}
+local printer_bar4 = {0.4, -0.5, -0.43, 0.43, 0.5, -0.4}
+local printer_box_plate = {-0.2, -0.5, -0.2, 0.2, -0.4, 0.2}
+local printer_top_box = {-0.5, 0.37, -0.5, 0.5, 0.5, 0.5}
+local printer_top_plate = {-0.4, 0.32, -0.4, 0.4, 0.37, 0.4}
+local printer_pen = {-0.05, 0.27, -0.05, 0.05, 0.37, 0.05}
+--End of nodebox
+
+function plastic_printer_data:register_blueprint(item, description, cost, drawing_image)--If you want to add a drawing image, I recommend using the color #C7CDD2
+    if drawing_image ~= nil then
+        minetest.register_craftitem(item.."_blueprint", {
+	        inventory_image = "printer_blueprint.png^"..drawing_image,
+	        description = description.." blueprint\n".."Requires "..cost.." plastic sheet to be printed",--Added this info about plastic cost so people can know how much they need
+            stack_max = 1,
+            groups = {printer_blueprint=1},
+        })
+    else
+        minetest.register_craftitem(item.."_blueprint", {
+	        inventory_image = "printer_blueprint.png",
+	        description = description.." blueprint\n".."Requires "..cost.." plastic sheet to be printed",--Fun fact: it took me a while to notice people can't guess the cost
+            stack_max = 1,
+            groups = {printer_blueprint=1},
+        })
+    end
+    blueprint_items.price[item.."_blueprint"] = "basic_materials:plastic_sheet "..cost
+    blueprint_items.result[item.."_blueprint"] = item
+    minetest.register_craft( {
+	    type = "shapeless",
+	    output = item.."_blueprint",
+	    recipe = {"3d_printer:blueprint", item},
+    })
+end
+
+--Items
+minetest.register_craftitem("3d_printer:blueprint", {
+	inventory_image = "printer_blueprint.png",
+	description = "Blank blueprint",
+    stack_max = 1,
+    groups = {printer_blueprint=1},
+})
+minetest.register_tool("3d_printer:battery", {
+	inventory_image = "printer_battery.png",
+	description = "Battery",
+    stack_max = 1,
+    groups = {printer_battery=1},
+})
+
+--Crafting
+minetest.register_craft( {
+	output = "3d_printer:printer",
+	recipe = {
+		{"basic_materials:plastic_sheet", "basic_materials:plastic_sheet", "basic_materials:plastic_sheet"},
+		{"default:steel_ingot", "default:mese_crystal_fragment", "default:steel_ingot"},
+		{"basic_materials:gear_steel", "basic_materials:plastic_sheet", "basic_materials:gear_steel"}
+	}
+})
+minetest.register_craft( {
+	output = "3d_printer:blueprint",
+	recipe = {
+		{"default:paper", "default:paper", "default:paper"},
+		{"default:paper", "dye:blue", "default:paper"},
+		{"default:paper", "default:paper", "default:paper"}
+	}
+})
+minetest.register_craft( {
+    type = "shapeless",
+    output = "3d_printer:battery",
+    recipe = {"default:copper_ingot", "default:mese_crystal_fragment"},
+})
+minetest.register_craft( {
+    type = "shapeless",
+    output = "default:mese_crystal_fragment",
+    recipe = {"3d_printer:battery"},
+})
+
+--The printer
+minetest.register_node("3d_printer:printer", {
+	description = "3D Printer",
+	tiles = {"3d_printer_top.png","3d_printer_bottom.png","3d_printer_side.png","3d_printer_side.png","3d_printer_side.png","3d_printer_side.png"},
+	groups = {oddly_breakable_by_hand=1, snappy=1, cracky=1},
+	sounds = default_stone_sounds,
+	paramtype = "light",
+    paramtype2 = "facedir",
+	drawtype = "nodebox",
+    is_ground_content = false,
+	node_box = {
+		type = "fixed",--Fun fact: I didn't use any kind of nodebox editor to build this, so it took me about an hour
+		fixed = {
+                printer_box,
+                printer_box2,
+                printer_box3,
+                printer_box4,
+                printer_box5,
+                printer_bar1,
+                printer_bar2,
+                printer_bar3,
+                printer_bar4,
+                printer_box_plate,
+                printer_top_box,
+                printer_top_plate,
+                printer_pen,
+			},
+		},
+    allow_metadata_inventory_put = allow_metadata_inventory_put,
+    can_dig = can_dig,
+    on_construct = function(pos)
+			local meta = minetest.get_meta(pos)
+			meta:set_string("formspec", "size[8,9]"
+			.. default.gui_bg
+			.. default.gui_bg_img
+			.. default.gui_slots
+			.. "label[3.75,0;Blueprint]"
+			.. "list[current_name;main;3.5,0.5;1,1;]"
+			.. "label[2.75,2;Plastic]"
+			.. "list[current_name;material;2.5,2.5;1,1;]"
+			.. "image[3.75,1.5;1,1;gui_printer_arrow.png^[transformr180]"
+			.. "image[3.5,2.3;1,1;gui_printer_arrow.png^[transformr90]"
+			.. "label[4.75,2;Battery]"
+			.. "list[current_name;battery;4.5,2.5;1,1;]"
+			.. "list[current_player;main;0,5;8,1;]"
+			.. "list[current_player;main;0,6.2;8,3;8]")
+
+			local inventory = meta:get_inventory()
+			inventory:set_size("main", 1)
+			inventory:set_size("material", 1)
+			inventory:set_size("battery", 1)
+    end,
+    on_punch = function(pos, node, puncher)--The original plan was to use a kind of furnance thing, but I don't have experience with formspec and the mod was causing lag
+	    local meta = minetest.get_meta(pos)
+	    local inv = meta:get_inventory()
+        local blueprint_used = inv:get_stack("main", 1):to_table()
+        local plastic_used = inv:get_stack("material", 1):to_table()
+        local battery = inv:get_stack("battery", 1):to_table()
+        if not plastic_used then return end
+        local plastic_count = plastic_used.count
+        --minetest.chat_send_player(puncher:get_player_name(), "working")
+        if battery.wear >= 58981.5 then
+            minetest.chat_send_player(puncher:get_player_name(), "Battery low")--Batteries wear out when the printer works
+            minetest.chat_send_player(puncher:get_player_name(), "Battery replacement needed")
+            return
+        end
+        if not (inv:is_empty("main") or inv:is_empty("material") or inv:is_empty("battery")) then
+            --minetest.chat_send_player(puncher:get_player_name(), "first check")
+            --minetest.chat_send_player(puncher:get_player_name(), plastic_used.name)
+            if plastic_used.name.." "..plastic_count == blueprint_items.price[blueprint_used.name] then
+                 --minetest.chat_send_player(puncher:get_player_name(), "second check")
+                if battery.name == "3d_printer:battery" then
+                    --minetest.chat_send_player(puncher:get_player_name(), "third check")
+                    inv:set_stack("material", 1, blueprint_items.result[blueprint_used.name])
+                    battery.wear = battery.wear + (65535/10)
+                    inv:set_stack("battery", 1, battery)
+                end
+            else
+                minetest.chat_send_player(puncher:get_player_name(), "Lack of plastic/Excessive plastic")
+            end
+        end
+    end,
+})
+
+--Battery blueprint used for testing
+--plastic_printer_data:register_blueprint("3d_printer:battery", "Test", "5", nil)