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I'd say you're unlikely to get much smaller than 10cm, given the average portafilter is about 6cm diameter, you don't want to be forcing your customers to have a too much accuracy when swinging their portafilter!
Can definitely see the point of standard tupperware looking a bit naff on the counter top, but it's probably worth looking into things that aren't explicitly knockboxes for the stove-top.
My initial DIY thought led me to this (admittedly off-topic) creation: https://www.instructables.com/Pringle-Can-MIDI-Drums/
mmccarthy
I could use some tupperware, but not the prettiest, or most inviting thing to live on a counter top where space is a premium.
I've got to do some measuring for the motta one, which might work.
Was wondering if there were any smaller alternatives.