MK8 Nozzle Checker
thingiverse
This is a basic block to hold a standard MK8 nozzle (such as for the Ender 3) for the purpose of checking it for imperfections using a small pocket microscope like this: https://tinyurl.com/4xncfr2f.
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With this file you will be able to print MK8 Nozzle Checker 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 MK8 Nozzle Checker.