Lossless elbow
A lossless elbow is a stationary elbow in a construction arm toolkit that allows a recipe to turn a corner with no exponential increase in construction cost. It is theoretically possible to construct lossless elbows for early construction arms such as the one in the 10hd Demonoid, but these would currently have to be very large.
The lossless elbow that has been used the most in practice is the Snark, which can be constructed directly on a single-channel construction lane using a Snarkmaker recipe. Controlled demolition of a Snark is also possible, to remove a temporary elbow that is no longer needed, and leave a hand target in its place if necessary for further construction.
A Silver reflector was used as a lossless elbow in the first spiral growth pattern, attached to a separate universal constructor component.