Made a FreeCAD tutorial for making this container: https://makertube.net/w/mg7rdKStSUua7AhnAt1RoM I have to warn you that I made a bunch of mistakes and it may be really hard to follow.
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I have a couple tips if you don't mind.
When sketching a line attached to a circle, using a tangent contraint will make the transition between the curve and straight smooth.
Rather than sketching the inside wall and cutting it away, you can just do a shell/thickness command. Alternately, you can offset a sketch from the outside geometry rather than drawing all the features manually again.
Consider how the part is made, you have two very sharp corners on the centerline where the nozzle cannot create the geometry, these areas will be rounded by default, it is better to add fillets so you control what the machine does.
Thank you! Those are great tips. I tried to use the thickness command when I was doing a practice run but it didn't work. I think because of the sharp area at the bottom of the heart. I'm thinking if I rounded it like you suggested it might have worked.