Print at 0.1 mm layer height for smoothest results.
There are 2 variants. I printed the 6-cart and 10-cart “standard” variants but couldn't get the “curvy” variant to print as well as I would have liked.
Here (image below) I tried printing the “test fit jig curvy” with 0.1 mm and 0.2 mm layer heights and neither worked particularly well. I believe that it's an issue with the material I'm using or my print settings. I think the model with the curve looks better so I still uploaded it, maybe it will work for other people. I didn't have any issues with the “standard” variant.
You can print the test fit jigs to verify your fit.
The author marked this model as their own original creation.