Crossed helical gear - shaft angle off
Some time ago I'd modelled an little crossed helical gear to use in some project. This project got skipped, but I'd had the gears made on a 3D printer, just to see how it works. Now SDGear are a really handy plugin for sketchup, number of teeth 26, pressure angle and so forth, and helix angle 45. I'd ordered two of these to make a crossed gear. Now I'd just received the finished gears, but the shaft angle is off by an significant value too! I'd just checked the crossed helical gear math, and that's done correct, two 45 deg. gears make 90 deg shaft angle. Anybody have any idea of what's gone wrong?

Cincerely, Sigmund