Be careful, don't hurt yourself or others. I'm not responsible for anything related to your actions :D
Inspired by : http://www.slingshotchannel.com/
Added 52mm diameter whisker biscuit recess.
Re-topologised and remodelled to reflect Joerg's revised slingbow design. STL file is high poly and OBJ file is low poly so it is easier for you to remix if you like.
A rough mix of Joerg Sprave's Rambone cleanup by Kulitorum (http://www.thingiverse.com/thing:311393) and Bmeece's whisker biscuit (http://www.thingiverse.com/thing:316711)
Haven't tested it with arrows yet ... but I'll update this soon.
Simplify3D Slicing : https://www.youtube.com/watch?v=tnLFRf8iX34
I haven't yet tested the strength of this slicing. Best to print as solid as you can if you are unsure.
Tying the dloop: https://youtu.be/A9VP8egeg-U?t=1m46s