Chamfer on a cookie cutter


I'm sorry if this has been asked on another post but I didn't find the information. I'd like to create a chamfer on my cookie cutter I create in Tinkercad. But as I'm new to 3d printing (and even more to design) I've no idea how to do it... My Cookie cutter are usually 1mm or 1.5 mm thick and it doesn't work great to cut sugarpaste. If I make them 0.5mm thick they are not "solid" enough, that's why a chamfer would be perfect.
Some advice or tutorial ?

Many thanks


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