Important: I scaled all the parts to 200% before printing! This way, the Batarang will have a more appropriate size. Also I can't tell if the parts fit together at the normal scale.
I recommend you to print the Base and Top parts at around 50% infill and with the logo facing upwards. You'll have to use supports, but it looks way better like that.
The wing has to be printed twice (once mirrored) and can be printed with only 10% infill. Of course you can go higher with that, if you'd like your Batarang to be a bit heavier.
I made my first print with a layer height of 0.3mm, but I'd go for 0.2mm or 0.1mm just for the blade to look a bit cleaner.
Let me know if you have any issues or suggestions regarding the model!
Have fun printing your very own Batarang. Let me see your results ;)