魔法礼物到我家！初识3D打印机 / Chapter 1: Magic Gift Arrives! First Meet with 3D Printer

十岁生日蜡烛的奶油香还沾在小星的鼻尖，他就迫不及待地扒到了客厅角落那两个盖着彩色拉菲草的大纸箱前——这是上周他许愿要的“魔法制造机”，爸爸妈妈居然真的把两台3D打印机给他搬回来了！姐姐举着手机在旁边拍他蹦跶的样子，笑着说：“慢点呀，别把礼物碰摔了，这俩可是你未来半年的‘魔法搭档’哦。” The creamy scent of the 10th birthday candle was still on Xiaoxing's nose, and he immediately rushed to the two large cardboard boxes covered with colorful raffia in the corner of the living room. Last week he had wished for a "magic making machine", and his parents actually moved two 3D printers for him! His sister held up her phone to film him jumping around, and said with a smile: "Take it easy, don't drop the gifts, these two will be your 'magic partners' for the next half year."

拉菲草被扯开的瞬间，彩色的泡沫颗粒像小雪粒一样滚了一地，小星直接把脸埋进了泡沫里蹭，沾得满脸都是碎屑，活像个刚从雪地里滚回来的小松鼠。姐姐笑着帮他拍掉脸上的泡沫，先撕开了印着银色机器人图案的白色箱子——这是爸妈特意标注的“入门款魔法机”，最适合新手小创客练手。 As the raffia was pulled apart, colorful foam particles rolled all over the floor like small snowflakes. Xiaoxing buried his face directly in the foam, getting small crumbs all over his face, just like a little squirrel that had just rolled in the snow. His sister laughed and brushed the foam off his face, then tore open the white box printed with a silver robot pattern first - this was the "entry-level magic machine" specially marked by his parents, most suitable for novice little makers to practice with.

箱子里除了方方正正的白色打印机主体，还整整齐齐码着几个小盒子，旁边放着一本中英双语的说明书、一套安全工具，还有五卷彩色的塑料耗材，红得像苹果，黄得像香蕉，蓝得像天空，绿得像树叶，还有一卷会发夜光的透明色。小星伸手摸了摸打印机的光滑外壳，上面有个小小的彩色屏幕，旁边还有几个圆滚滚的按键，像游戏机的手柄。 Inside the box, in addition to the square white printer body, there were several small boxes neatly arranged, with a bilingual Chinese-English manual, a set of safety tools, and five rolls of colored plastic consumables: red like an apple, yellow like a banana, blue like the sky, green like leaves, and a roll of glowing transparent material. Xiaoxing reached out and touched the smooth shell of the printer, which had a small color screen and several round buttons next to it, just like a game console controller.

“这个是FDM打印机，全称熔融沉积成型，是最常见的3D打印机，你可以把它理解成一个超级挤奶油的机器。”姐姐蹲下来，指着打印机的各个部件给他讲，“你看这个是打印平台，就是放东西的‘魔法底盘’，上面有细密的纹路，防止打印的时候物品粘不住掉下来；这个是挤出机，就是挤奶油的‘枪头’，塑料耗材从这里进去，会被加热到200摄氏度融化，然后从下面的小孔挤出来，一层一层堆在平台上，冷却之后就会变成硬硬的实体，就像你玩橡皮泥一层层堆出小房子一样。” "This is an FDM printer, full name Fused Deposition Modeling, the most common 3D printer. You can think of it as a super ice cream squeezing machine." Sister squatted down and pointed to the various parts of the printer to explain to him: "This is the print bed, the 'magic chassis' for placing things, with fine lines on it to prevent the printed items from falling off due to poor adhesion; this is the extruder, the 'nozzle' for squeezing cream. The plastic filament goes in here, gets heated to 200 degrees Celsius to melt, then squeezes out from the small hole below, stacking layer by layer on the platform. After cooling, it becomes a hard solid, just like you stack a small house with clay layer by layer.”

旁边透明的小架子是料架，用来放耗材卷的，拆开包装把耗材卡上去，机器就能自动送料了。姐姐还拿出一个金属的小铲子和镊子：“这个是模型铲，打印完了用来把模型从平台上铲下来，镊子用来夹小的零件，要是打印的时候掉了，可以用镊子捡起来重新粘。” The transparent shelf next to it is the filament holder, used to hold the filament spool. After unpacking, clip the filament on it, and the machine can automatically feed the material. Sister also took out a small metal spatula and tweezers: "This is the model scraper, used to shovel the model off the platform after printing. The tweezers are used to clamp small parts. If they fall off during printing, you can pick them up with tweezers and glue them back on."

小星听得眼睛都亮了，伸手戳了戳打印平台的纹路，又问：“那FDM能打印什么呀？”“几乎所有你能想到的硬质物品哦。”姐姐拿出手机给他看图片，“比如玩具、文具盒、手机壳、花盆，甚至有人用FDM打印了能住的小房子，还有汽车的零件、机器人的部件，只要你建好模型，它就能帮你做出来。” Xiaoxing's eyes lit up, and he poked the lines on the print bed, then asked: "What can FDM print?" "Almost any hard item you can think of." Sister took out her phone to show him pictures: "For example, toys, pencil cases, phone cases, flowerpots, and even someone used FDM to print a small house to live in, as well as car parts and robot parts. As long as you build the model, it can help you make it."

还没等小星继续问，姐姐已经拆开了第二个蓝色的箱子——这是爸妈准备的“进阶款魔法机”，SLA光固化打印机。这台机器比FDM的小一点，上面有个透明的防尘盖，整体看起来像个精致的首饰盒。 Before Xiaoxing could ask more, his sister had already opened the second blue box - this was the "advanced magic machine" prepared by his parents, the SLA stereolithography printer. This machine is smaller than the FDM, with a transparent dust cover on top, looking like an exquisite jewelry box overall.

“这个是SLA打印机，全称光固化成型，是‘光影魔法师’，用的是液态的光敏树脂，用紫外线照哪里，哪里就会瞬间变硬，所以打印出来的东西特别光滑，特别精细，连你发卡上的小钻石都能打印得一模一样。”姐姐掀开防尘盖，指着里面的部件讲，“你看这个是树脂槽，透明的，里面装的就是淡蓝色的光敏树脂，有淡淡的香味，不过绝对不能碰哦，要是沾到手上要马上用酒精擦，不然会过敏；这个是升降平台，打印的时候会慢慢往上抬，一层一层把打印好的模型拉出来；这个是激光扫描模块，就是SLA的‘魔法画笔’，用紫外线激光照着树脂，就能画出每一层的形状；这个是护目镜，紫外线会伤眼睛，操作SLA的时候一定要戴。” "This is an SLA printer, full name Stereolithography, the 'light and shadow wizard'. It uses liquid photopolymer resin, and wherever it is illuminated by ultraviolet light, it will instantly harden, so the printed items are especially smooth and fine, even the small diamonds on your hair clip can be printed exactly the same." Sister lifted the dust cover and pointed to the parts inside to explain: "This is the resin vat, transparent, with light blue photosensitive resin inside, which has a faint scent. But you must never touch it. If it gets on your hands, wipe it off with alcohol immediately, otherwise you will have an allergic reaction. This is the lifting platform, which will slowly move up during printing, layer by layer pulling the printed model out; this is the laser scanning module, the 'magic paintbrush' of the SLA, which uses ultraviolet laser to shine on the resin, drawing the shape of each layer; this is the safety goggles, as ultraviolet light can damage the eyes, you must wear them when operating the SLA."

小星拿起护目镜往头上一戴，对着客厅的镜子晃脑袋，活像个刚出任务的特工，他问：“那SLA能打印什么呀？”“适合打印特别小的、需要很精细的东西。”姐姐拿出手机给他看SLA打印的成品，“比如珠宝、手办、牙齿模型、电路板的部件，还有你上次想要的公主戒指，用SLA打印出来，光滑得像真的银戒指一样。” Xiaoxing picked up the safety goggles and put them on his head, shaking his head in front of the living room mirror, just like a special agent who had just returned from a mission. He asked: "What can SLA print?" "It is suitable for printing very small things that require high precision." Sister took out her phone to show him SLA printed products: "For example, jewelry, figurines, dental models, circuit board components, and the princess ring you wanted last time. If printed with SLA, it will be as smooth as a real silver ring."

拆完箱之后，客厅的地上堆满了包装盒、泡沫颗粒和各个部件，小星抱着那卷夜光PLA耗材舍不得撒手，姐姐笑着戳戳他的脑袋：“别光顾着摸耗材啦，我们先来玩两个魔法小实验，帮你搞懂这两台打印机到底是怎么工作的。” After unpacking, the living room floor was piled with packaging boxes, foam particles and various parts. Xiaoxing held the roll of glowing PLA filament and didn't want to let go. Sister poked his head with a smile: "Stop touching the filament, let's play two magic small experiments first to help you understand how these two printers work."

第一个实验是模拟FDM打印的“分层橡皮泥大挑战”，姐姐找出了家里三种不同颜色的橡皮泥，还有一块平的硬纸板当“打印平台”。她先把红色的橡皮泥压成薄薄的一层铺在硬纸板上，告诉小星：“这就是FDM打印的第一层，是最底层。”然后她把黄色的橡皮泥搓成细长的条，压在红色的上面，压得平平整整：“这是第二层，就像FDM打印头挤出来的第二圈塑料。”最后她把绿色的橡皮泥也压成薄片，盖在黄色上面，还捏出了一个小屋顶的形状：“你看，我们就像FDM打印机一样，一层一层堆出了一个小房子，是不是和3D打印的原理一模一样？” The first experiment was the "layered clay challenge" to simulate FDM printing. Sister found three different colors of clay at home and a flat piece of cardboard as the "print bed". She first pressed the red clay into a thin layer and spread it on the cardboard, telling Xiaoxing: "This is the first layer of FDM printing, the bottom layer." Then she rolled the yellow clay into a long strip and pressed it on top of the red one, flattening it: "This is the second layer, just like the second circle of plastic squeezed out by the FDM print head." Finally, she pressed the green clay into a thin sheet and covered it on the yellow one, also shaping a small roof: "You see, we are just like an FDM printer, stacking a small house layer by layer, isn't it exactly the same as the principle of 3D printing?"

小星兴奋得不行，抢过橡皮泥就要自己堆，他先把蓝色的橡皮泥压成底，然后用红色的搓了个小烟囱，用白色的做了个小窗户，举着给姐姐看：“你看我堆的小房子！以后我要用FDM打印一个真的能住的小