GM-triangel handle knob nut
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Reverse engineered knob nut from GM
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- Automotive
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- Creative Commons — Public Domain
Reversed Engineered triangel handle knob nuts from GM. After I've lost one, I made a reversed engineered copy of this 'knob nut'. It is part of the interior of the back lights of an Opel/Vauxhall Combo. I assume that GM uses this in other cars or assemblies as well.
The picture shows the original (dirty) part in the middle, left and right are the newly printed ones.
I made the CAD with Onshape (Free), please use this link, if you want to copy, export, modify or whatever else with the knob (https://cad.onshape.com/documents/6d1597fd4a3ff88d9a4dabf2/v/de46bc1448317a5547dc0e54/e/ae4666ab28fc4c9c13955bc8?renderMode=0&uiState=69567116f4ffcb48da3e68d2)
Since I very much like the threaded inserts from CNC-kitchen I've made the knob specifically for the M5 threaded inserts from them (recommended version, tested).
In the files I added a version without any hole, so you can make your own hole (e.g. negative cylinder volume modifier within the slicer) for your favorite inserts. (for the more DIY approach)
There is also a version with a hole for an M5 tap in the part modeled, so you could just print it directly without any inserts and cut the treads yourself. (untested! not recommended yet) (Also you could heat up your screw and use it as "tap" for cutting the threads.)
Recommendations for printing
I recommend PETG and ASA as printing material. I would not recommend PLA, since the device will most likely be used in a car.
Print upside down (hole for the insert in the air) with simple supports activated (leaves potentially marks from the interface layer)
OR
Print correctly oriented (hole down facing), enable supports, BUT make a cylindric modifier to block supports inside the hole.25% infill was more then enough for my needs
If its to weak then try first increasing the number of perimeters.
I don't know the gm part number of the knob yet, if you know please let me know so people searching for this can find it faster. If you need other sizes or variants, also let me know.
Happy Printing! :D