Because the wifey said so haha. But when you have some small people and you need to make and clean bottles all the time. The rubber heads on the bottles can sit fine on it and dry by air.
PART2 i would recommend to make it solid. The PART2 file you wil need to perform a cut in the slicer, you can have both arms on a mk3 bed.
You should be able to sit the arms down in PART1 without to glueing it together
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