Round Mini Test Tube Holder. Should fit 9 standard size test tubes. Has 8 drying rods. Should be able to be 3D printed in two parts on a 6" x 6" size bed (you may need to disable the skirt by setting skirt to 0).
UPDATE 4/19/2018: I finally printed one! It seems to work quite well. I had to update the holes a little bit, but they should be good now. I had to print with no skirt on my lulzbot mini and i printed at 10% infill. I think i will design a smaller simpler version too. If you want the solidworks files and/or STEP files let me know. Enjoy!
May need to disable the skirt feature under Cura in Expert settings on larger prints if it approaches edge of 6" x 6" bed. I printed mine on a Lulzbot Mini.