Mirabelle stone removal tool
thingiverse
I had to take out the stones from 9 kilograms of mirabelles immediately. Fast search on Thingiverse turned up this: https://www.thingiverse.com/thing:3659862 Needed to tweak dimensions for slightly larger stones of mirabelles instead of cherries, and wanted to simplify design for shorter print time. My version prints upright in about an hour on my old A8 without support. So far, no problems regarding strength even with vertical layer lines - worked through about 6 kilograms of mirabelles so far...
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