Hey @JohnPJones,
Welcome to the Ultimaker Community 🚀
I agree with @dsp, a picture with how your printjob fails would really help our troubleshooting.
I took a look at your file and I did notice that this "knob" is not connected to your model, so if you don't make that solid it will always fail.
Also, removing this support is going to be quite tricky.
Are you sure you need this window to be so deep?
If you leave out the support it is going to be super tricky to bridge:
Are these the kind of fails you are referring to?
Recommended Posts
dsp 20
can you add some pictures on how it fails? it does not look like a hard print.
Also have you checked if the model is watertight?
I don't have a tinkercad account so can't try for you
Link to post
Share on other sites