(large) test tube stand

Test tube stand for large test tubes ( d = 30 mm, h = 20 cm ),
Fusion 360 file for modifications is included

I made multiple test tube stands, which can be found here:
Version for 7 small tubes: https://www.thingiverse.com/thing:2460058
Version for 7 normal sized tubes: https://www.thingiverse.com/thing:2719817
Version for 7 large tubes: https://www.thingiverse.com/thing:2460095

I also made a stand for round-bottom flasks, which can be found here: https://www.thingiverse.com/thing:2413613