The picture is a demonstration of my prototype which cracked after putting it on the counter top. I'm not sure what the syringe type tools are but I was asked by the science department to design these for the labs. I would highly recommend 50% or higher infill for durability and supports are absolutely needed. The difference between the prototype and #2 is that #2 is thicker and has a 1mm larger gap to grab the table along with .25mm bumps for extra tension. The third version is the same as the second except the holes are farther apart.

MakerBot

MakerBot Replicator+

Doesn't Matter

Yes

50% or higher