This is a holder for Hach TNTplus tubes. For our uses, I slightly separated the whole thing out for groups of three to be placed together more conspicuously. 

Legs should be sized correctly for Bambu PLA and Polyterra PLA filaments, but may need to be adjusted for others. 

Legs should fit firmly into the sockets, and be able to stay solidly in place just through friction. 

Model design makes it so this is a relatively quick print with low material usage while still being very solid.