Redditの「r/3Dprinting」でとんでもない投稿を見かけました。ラジコンカーのボディを全部ゼロから3Dプリンターで自作した方が現れたんです。その仕上がりが本物のLancia Delta HF Integraleのミニチュアみたいで、見た時は目を疑いました。Hackadayなどのテックサイトでもピックアップされていたんですよ。

使用機材はEnder 5 Plus。3D設計ソフトFusion 360でデータを起こして、23枚のパーツに分割してプリント。合計47時間の大作なんです。

When someone takes a hobby to the next level, you just have to applaud them. And that's exactly what happened when I stumbled upon an incredible post on Reddit's r/3Dprinting. Someone went all out and 3D printed an entire RC car body from scratch! We're talking about a full, detailed body for a remote-controlled car, made completely from the ground up.

The result? A miniature Lancia Delta HF Integrale that looks so good, I had to do a double-take. This project has even been featured on international tech sites like Hackaday, earning high praise for its technical prowess. The creator used an Ender 5 Plus – a bit larger than my own Ender 3 S1 Pro – and leveraged Fusion 360 for the 3D design. The body was split into 23 separate parts and took a total of 47 hours to print. They used 1.2kg of common gray PETG filament, which is roughly enough to make dozens of giant cookie cutters, for a total material cost of just $35 (about 5,000 yen) for filament and paint. Amazing!

素材と費用の話

素材は一般的なPETG・グレーを1.2kg使用。フィラメント代と塗料代を合わせて35ドル（約5,000円）というから驚きます。RCカーの既製品ボディを買うより安い場合もあるんですよ。

丁寧な後処理が仕上がりを決める

プリントして終わりじゃないのが3Dプリントの奥深さ。120番→240番→400番とヤスリで丁寧に研磨して積層痕を消してから、プライマーを吹いて塗装しているとのこと。この工程を惜しまないのが「綺麗な仕上がり」と「そうでないもの」の分かれ道なんです。

「設計から塗装まで全部自分でやった」という完成した時の達成感は、既製品には出せないものがあると思います。RCカーも3Dプリンターも持っていれば、次の休日の過ごし方が決まりそうです。

Sanding for Days, Painting Like a Pro

But it wasn't just about printing. The real magic happened with the post-processing. The parts were meticulously sanded with 120, 240, and 400 grit sandpaper to eliminate layer lines and achieve a super smooth finish. After that, automotive primer and metallic silver paint were applied, resulting in a professional-grade luster that makes it look like a store-bought model. The sheer dedication is palpable!

The creator mentioned that the biggest challenge was dealing with warping on the large bonnet panel – a common issue with 3D printing large, flat surfaces. This was apparently solved by printing the part at a 45-degree angle with a 'brim' for better adhesion. Print settings were 0.2mm layer height, 3 wall lines, and a 15% infill. This incredible project garnered over 8,400 upvotes on Reddit, a testament to the creator's passion and skill. It makes me want to put my cookie-cutter expertise to use and tackle something this ambitious one day!