A fairly basic test tube rack with holes for 5 tubes, up to 23mm diameter tubes.
Mine is in ABS.
In hindsight, now that it's printed (hence these machines used to be called rapid prototypers!) I would make the legs a little sturdier (therefore I have included the original .blend file for those who can use Blender.
I didn't use a raft - see instructions!!!
test-tube-rack-simple.blend | 518.5KB | |
test-tube-rack-simple.stl | 109.8KB | |
test-tube-rack-simple.thing | 26.0KB |