This pipette holder was derived from the DeRisi lab design which can be found here: http://derisilab.ucsf.edu/index.php?3D=92 It is designed to hold Eppendorf pipettes but should work for a few other brands as well. We are going to use a drill and screws to attach them to our shelves. The original design used 3M sticky pads but I'm not sure they would support the weight of 4 pipettes. Please note this takes a while to print. It took about 10 hours on our machine.