Before I printed this, i had four tubes hold in place with some wire... it was a mess. As a result, the liquid would leave a drop at the bottom of the tube, that would dry and leave crystals that stuck the tubes. This bracket may be a little oversized... But tubes can be a little heavy. Anyway, since I use it, no tube got stuck ! I don't even need to clean them. Edit: If you need a different hole count to accomodate for more or less tubes, here is a customizable item :http://www.thingiverse.com/thing:929873 Hope you like it !