Eppendorf test tube rack
thingiverse
I use these with a introduction practical biology, working with a micropipette This is a small Eppendorf test tube rack for 6, ∅10 mm tubes Or invert the rack and you can place 6, ∅8 mm tubes Made from acrylic and four M3 bolts. And four M3 20 mm Hexagonal female brass Standoff/Spacer. I'am a lasercutter man ; but if you're more an 3D printer, I think this design is better choice https://www.thingiverse.com/thing:3377154
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