I have done these with 3 and 4 layer walls and 20% fill in PLA. A user that used my ¾" conduit brackets requested a bracket that would take a combination of ½" and ¾" conduit. The ½" on these is the sliding leg, the ¾" is the butt joint. When assembled with the simple hardware sold on the Target Forge website these are very strong and repeatable joints.
https://targetforge.net/shop/ols/products/34-emt-conduit-hardware
The author remixed this model.