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nice to hear you like the lid. Sorry for that late response. It is easy possible to make your remix with flat bottom using the customizer:
There are two parameters for the bottom chamfer:
Outside Chamfer: Container outside chamfer in percent of diameter
Inside Chamfer: Container inside chamfer in percent of diameter
Setting the outside to zero you will get what you want.
But as filipbys say using brim may be necessary. I printed my copies (up to 50mm) all without brim. Without problems. All printed with PLA.