Knex Rod to Lego Rod
thingiverse
I created a rod that is both Knex and Lego compatible. I use it to use Knex motors as Lego motors. If you use this, you might be interested in the giant Lego gears I have designed here: https://www.thingiverse.com/thing:4180961.
Download Model from thingiverse
With this file you will be able to print Knex Rod to Lego Rod 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 Knex Rod to Lego Rod.