This is a simple adapter to mount a 50mm radial blower onto a 40mm axial fan mount. Used this to mount a blower onto my Monoprice Maker Select V2.1.
It's a bit of a hack job and not that pretty, but it seems to work okay. Printed with something heat tolerant works best.
Update: V2 has a little notch, so the arm has clearance for the mounting bar on my printer when mounted pointing up.
IMPORTANT: Measure the nozzle of your blower. If it is 19.1 x 15 mm this should work for your. I just bought a new blower that measures 19.7 x 15 mm and it doesn't quite fit. I'll work on an updated model to fit that size sometime soon. [Never mind. It turns out you can jam it in there if properly motivated.]
You'll need some screws, but I think you can figure that out. You can rotate this whichever way works for you.