About this 3D model

Test tubes rack for your chemistry set. Now for different sizes of test tubes. *laboratory test tubes* - 29x 13mm x 100mm - 29x 16mm x 160mm *vanilla bean glas tubes* - 14x 15mm x 160mm - 14x 15mm x 160mm screw edition I'd really like to add this to category "Chemistry" but thingyverse does not react to my request as there is no such category right now. ;-(