THIS FILE IS PROPORTIONED IN INCHES. SET REPETIER OR YOUR CONTROLLER PROGRAM TO IMPORT FILES IN INCHES. After witnessing my father knock a bottle of insulin off the table yesterday, I designed this holder to simply hold 2 10ml bottles of Humulin or Novolin and a standard syringe. The center socket has a hole designed for a #8 pan head wood screw or #6-32 machine screw. It could also be mounted with adhesive-backed velcro, mounting tape, sticky putty or whatever you like. THIS FILE IS PROPORTIONED IN INCHES. SET REPETIER OR YOUR CONTROLLER PROGRAM TO IMPORT FILES IN INCHES. I printed in natural ABS and simply colored the flat surface of the letters with a Sharpie. Using a 1/64" nozzle (aka .4mm for you pitiable, misguided metric-lovers) this is a very economical thing to print, as the walls are only 2 layers thick. This fits the 1/3 oz (aka 10mL) Humulin and Novolin bottles. There's a taller- and thinner-bottled kind of insulin out there that won't fit securely but will obviously still fit.