Part 8 M2BLSC Boxer-Engine

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This is part 8 of our workshop - now we're going to tackle the boxer engine in all its forms. First off, things are about to get a bit more complicated. The issue here is that for the first time ever, two crankpins will be needed (in the inline engine, it gets really complicated). Trying to print such a crankshaft as one solid piece just doesn't cut it - the results are hardly satisfactory. Plus, I wouldn't be able to attach the connecting rods from my "kit" then. That's why I'm using a custom-built crankshaft made up of two separate parts. The offset of those crankpins also means that now we need two different cylinders, since they're no longer in line with each other. This makes the dovetail guide on one cylinder higher than usual. We actually already needed this type of cylinder for our radial engine, so it's a good thing. Other than that, we can stick with standard components: regular pistons, flat connecting rods (which we got from the V-engine), at least one of those two cylinders, and the cylinder cover. In each variant, we'll need a cylinder head screw M3 x 8 with nut, as well as another one in the bolted version - this time with a safety nut. For the ball bearing version, we just swap out that last screw for a countersunk screw. And once again, spacer rings or conical rings come in handy. One more thing: since we're using our base model twice over, it also serves as a single-cylinder engine stand. As for the stand version of the boxer engine, well - it's got a T-shape to it. For experienced engine builders like ourselves (just refer back to previous parts of this workshop), assembling all these components should be straightforward enough - and from the pictures, you can probably figure it out too. It'll take around 15 minutes to put everything together.