Laboratory Rack for Conical Tube (Butterfly Rack) for 3D printer
thingiverse
This rack can carry two size of conical tube in single rack. This is .stl version for 3D printer user of acrylic version (https://www.thingiverse.com/thing:3720067). Don't delete middle floor of rack, because this part is important for guiding the tube to the hole in the bottom floor.
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