@timahrens @letterror Are you actually ‘scaling’ the axis, though? Unless you are also scaling the outlines, metrics, etc. it seems to me that all you are actually doing is increasing or decreasing the resolution of the axis, i.e. changing the number of addressable intervals on the axis. So if an axis between two otherwise unchanged design locations is 1000 units or 10 units, the axis isn’t any longer or shorter, because its length is determined by the glyphs at either end. The distance between them can be subdivided into more or fewer units, which is determining what is addressable on that axis and in the space between it and other axes (presuming only integers are addressable), but isn’t changing the outline interpolation at relative commonly addressable positions.