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Could you share the *.stl file you used for the bowl? I tried printing the one provided, but it seems to be intended for the larger 16mm transducers. I mistakenly ordered a bunch of the smaller ones (MA40S4S, 10mm diameter) and the paper they wrote didn't supply a bowl *.stl for that size.
Open a Padlock with One Paperclip, Nothing Else
Solar Thermally Pumped Hydroponic System