Print Profile(1)
Description
This set of 1/2" EMT Connectors has a special feature that significantly increases the strength over other designs. The glue-on reinforcing caps are printed with layers perpendicular to the main body of each fitting virtually eliminating splitting the ends of the fittings and preventing layer line separation along the length of the bodies. The gussets add additional strength.
The caps are glued in place with a small amount of flexible CA glue or SMALL amount foaming polyurethane type glue (like Gorilla glue). Be careful with the foaming poly glue as you can partially push off the fitting cap or block the opening with the expanding foam. A little goes a long way.
This is made exclusively for 1/2" EMT. My first print was 18.3mm ID, but I upped this to 18.35mm ID to give a bit more room as EMT is not exactly consistent in OD. I used this in my garden for a trellis frame and when installing and aligning the individual conduits resulted in great force being applied to the fittings with not one fitting breaking under the stress. We even drove one very tight fitting connector onto the EMT with a hammer and had no problem.
As you can see in the print profile, the bodies are printed on their sides while the reinforcing caps are printed face down to get the perpendicular layer effect. I looked high and low for something that would work, but they all split or break along layer lines very easily. These might be the strongest 3D printed EMT connectors out there, but if you find some stronger, please let me know. Will be happy to make other variations if requested in the comments and if they fit into the family. I don't have a way to print 3-Way Corners and 4-Way Edges to follow the same method and get the perpendicular layers throughout the part, so those have been left out for now. If a three dimensional structure is required, multiple fittings can be placed adjacently and rotated to any orientation. Watch out for assembly traps, especially when angle connectors are being used, such as in a truss.
Of course it goes without saying that when I say "High Strength", that is in context of 3-D printed parts. Although I haven't tried to force break one, I have not broken one in rough handling including forcing in the EMT when alignment was visibly off. Some of the emt even has a slight curve to it after installation. So this is strong for its intended purpose as light duty trellis or other light support framework.
Note: Never use any Hobby/DIY 3-D printed part for a human live load or in an overhead location where humans are present, or as part of any human life safety or life support system.
License
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