Duplo Technic Brick

A modified 2x4 duplo technic brick


I really wanted to use cfinke's - Customizable LEGO-Compatible Brick generator (https://www.thingiverse.com/thing:615256) to generate some more duplo technic blocks but even after getting the script to work in openscad I found the technic holes it generated did not line up with the aliexpress duplo technic holes.
Luckily ortwin has come through with the goods again with a compatible duplo brick design as well as an additional technic hole added on the end, I copied the internal design from cfinke but use the dimensions from ortwin. I also rounded some edges for kid safety and kept the counterbored technic holes to make them compatible with the duplo pins I have recently uploaded (https://www.thingiverse.com/thing:6412091)

Images:
- First image shows the great compatibility with existing aliexpress duplo technic as well as with the printed technic pins
- Second image shows comparison of cfinke and ortwins block dimensions, you can see the c