6mm dowel
thingiverse
This is a pin for the puzzle plane by Demoss (https://www.thingiverse.com/thing:3255904) to hold the parts together before you glue in magnets. As the magnet size is 3x6mm I sized these to stick out just for testing the parts. Untested as of now.
Download Model from thingiverse
With this file you will be able to print 6mm dowel 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 6mm dowel.