So I sculpted this for a school project using ZBrush. I'm working on a full size moped model, but I can't really spare the time to fix it myself so I'm willing to recruit someone who could make this printable! There are some holes in this model that need to be patched, and it seems a whole flat wall is missing. I'm not really sure what went wrong. It is very important that the model remain the same size! For some reason these problems only happened to this half of the handlebar assembly, so the half with the problems (the half you would be working on) needs to fit the good half perfectly when its printed. Thanks! I'll leave this posted here for a couple days before I give into a time crunch and fix it myself.
You've got quite a mess there. The areas with the blue arrows may need complete reconstruction. It would probably be best to re-attempt the boolean operation that allowed this to happen.