The design of this clip takes full advantage how FDM printing works, and I think it's kindof amazing actually. I wish more model makers would do this. I printed this with black Creality PETG CF and transparent Creality PETG. Since this model is built for functionality, it should be printed in something stronger than pla, and able to withstand bending. IMPORTANT NOTE: The zip file that you download for this model package will unzip to a file called Mobile Clip.stl. That file is actually misnamed. It is not an .stl file, it's actually a .3mf file. So if you download the package you'll have to rename that Mobile Clip.stl file to Mobile Clip.3mf. If you don't want to do that, you can use the print settings I posted where I have done that for you. Excellent work on this model. Very useful for any surface (kitchen counter or table for example) not just in the car.