So I created one side of a crude pistol grip in tinkercad. I used basic shapes grouped together to get to this point as I'm not a designer or modeler by any means. Getting the right angles and things to line up was brutal for me. But now I have weird inner shapes happening when trying to print and the middle layer has a weird triangle depression on one side. The very top section is placed at a certain angle relative to the overall grip because it fits inside the frame of the pistol. So I can't just make a really thin layer rectangle that covers to entire size of the grip and lower it down to flatten out middle layer, that would delete the part that fits into the pistol frame. I have no idea how to fix these things so any help would be greatly appreciated. You can see in the picture all the different shapes I was using to get what I wanted.
Cleaning Up a Model