Eppendorf (Microcentrifuge) Tube Rack

This Eppendorf (microcentrifuge) tube holder took inspiration from Stefan Huber's model (https://www.printables.com/model/310767). I tried printing Stefan's model numerous times but the spring part of the rack was consistently failing on print or post-print. So I designed this model from the ground up to address the issues I was having. But I did want to give credit for the inspiration. I wasn't sure if this should be considered a remix since I did not actually modify the original model. 

Print with springs down on the bed (legs up). 

This is a modular design. My colleagues initially wanted 40 tube racks so that is what I designed originally. I have since added multiple rack sizes. Note that some racks are 4 wide and others are 5 wide. There are 2 versions of the 40 tube rack now, the original 4 wide rack and now a 5 wide rack. Since the spring component of the module is modular, any size rack could be created however I think the selection should cover most users' needs.