Once printed the spring may require some post processing. This will take the form of removing any strings from between the coils and any remaining brim still attached to cog edges and smoothing the back These can be removed with a combination of filing/sanding or cutting. This is to prevent extra friction being created between the coils and the cog with the surround. Additionally the equilateral cross holes are compatible with LEGO connecter axles and may require widening with a small flat surfaced needle file.