Parametric tube rack

Parametric tube stand, designed in OpenSCAD

Ever had to work with quite a few NMR tubes using eppendorf/falcom stands or pipette tips racks? Tubes won't stay in place, use too much bench space, mix.

So I decided to design a tube stand. And I made it parametric, so it can be used to generate arbitrary stands for different kind of tubes and sizes as desired. I posted a picture of a "working" model with holes separated by 15 mm and of a "storage" model (more compact but more difficult to manipulate) with holes separated 10 mm.

You can preview the assembled tube stand by uncommenting the final lines, and then render each part separately as STL to print

Parameters

`holeDiam=5 ; //diameter of holes: 6.5mm for NMR tubes; 12mm for eppendorf tubes; 18mm for 15ml Falcom tubes; 30mm for 50 ml Falcom tubes; 14 mm for cuvettes;`
`squareHoles=false; // square holes for cuvettes`
`w_distance=15 ; //distance between the center of the holes in the width direction. Has to be