Knife/Letter Opener with Solidworks 2014 source
thingiverse
Printing on an i3 using supports is a real challenge, but if you take a closer look at the instructions, it becomes more manageable. The resulting tool can be used as it is to open mail or for something like cutting paper; either way, it's worth a shot. Using a 60mm brim with two layers and an infill of 40-50% seems to be key to printing this on your i3, assuming your slicer will let you. Adding five walls/shells if you're planning on sharpening the tool is recommended, or just print it with 20-25% infill for a simple letter opener. Print settings suggest slowing down, or the thing may fall apart, even with extra brim and a 60mm support. The real trick here seems to be in the slow and steady approach you should take when printing this.
With this file you will be able to print Knife/Letter Opener with Solidworks 2014 source with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Knife/Letter Opener with Solidworks 2014 source.