Print in Place Flexible Conduit Fitting.

This fitting is for connecting a 32mm (outer diameter), square grooved, flexible conduit to a panel or equipment rack. 

Just because I wondered if this was possible, although it would be easier and cheaper to buy some from an electrical wholesaler.

I've not tested this in the real world yet, but I could not get it to fail on the bench.

The thread is M32 (32 x 1.5mm).

Update 12/06/25:

Increased the tolerance of the locknut to +0.4mm to make it easier to thread onto the conduit fitting. Note: the print files, .bgcode and .3mf contain the original locknut. I've also added a coupler to allow two fittings to be connected together.

Operation:

If you're not familiar with this type of fitting it works like this:

With the outer sleeve down, the fitting is unlocked and the flexible conduit can be inserted or removed.

To lock the conduit in place, pull the sleeve up and twist.  

Printing:

Print with PCTG or another material that is ductile and that has very good layer adhesion. If you don't it will fall apart, trust me. 

Print with 4 Walls, 15% Infill.

Supports are required, but these are easy to remove and will leave little scarring. Use paint on supports and select for enforcers only. No supports are needed for the threads.

Once you have the supports removed check that all of the tabs are free to flex inwards. If not squeeze the locking ring a bit to free them up or try gently bending them inwards. Then free up the locking ring by moving it up and down first and then by twisting. 

It may take a while to free up the parts, however once free they will become easier to move with use.

Feedback:

If you download and print this let me know any thoughts you may have, feedback is always welcome.