Subtracting from a complex object

Hi I am trying to take a chunk out of a 3D object (hockey puck) but I am unable to figure out how to do it.
I tried subtracting but it does not recognize the object as solid.
Here is a pick of what I am trying to achieve.

any advice would be greatly appreciated.

Why isn’t the puck a solid? There’s no way we can tell you that from a screenshot. Share the .skp file so we can see what you are working with.

puck.skp (1.9 MB)

here is the file i am working from. my understanding is that it is a print ready file for 3d printing, but i am really green in this area as i don’t know much about 3d printing

My guess is you received this as an .stl and imported it into sketchup. Problem it shows is lots of holes, these may well have been created due to importing the .stl at too small a scale. Try importing it in meters and see if it is a solid then.
You could attach the original file for one of us to check.

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@Box is correct. You should be working at a larger scale. Meters is good because it makes the translation to millimeters, which most slicers use, simple. Also set the model units to Meters and turn off Length Snapping.

This is what Solid Inspector2 says needs to be fixed.

If importing the .stl using meters doesn’t improve things I think it would be easier to create a new model from scratch than manually go through and fix the holes implied by those surface borders.

Heres the file with the puck as a solid group.
puck.skp (2.2 MB)
And here some videos of how it was done, I used Flowify(obviously) vertex tools. from ThomThom, to fix the four parts where the middle of the geometry met, and Bevel tool from Mindsight studios, Cleanup3 to get rid of unnecessary geometry, and Solid inspector 2 to check if it was a solid object, both plugins from ThomThom.