Free 

I tried a few other prints like this but wasn't happy with them so I ended up designing my own version.
There are 2 lengths. A short and a long depending on the thickness of the material. There's only about 3mm difference in length for the 2 sizes. I also included the STEP files so feel free to edit it as needed.
I printed this in PETG using the current orientation of the model. It helps to make the part stiffer and more durable.












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