Here is a grip I made.  The 3mf file has the fuzzy skin applied and a no support orientation.  Make sure you have bed adhesion!

Being lazy I used contact cement to glue them on.  I did test it before hand and if you just place a few dots you can twist them off with relative ease and the glue residue simply rubs off.

Gorilla Clear Grip Contact Adhesive

**EDIT- If you put too much on, use a thin tool like a drywall spatula which will slide underneath and separate the two with ease (just had to do that)

update: grips removed after 4 months for a new grip shape, no issues, or damage.

My next revision if I get to it would be making a small low profile mount that is glued on and somewhat comfortable to attach the big grips onto so you can use typical Nintendo case accessories.  I currently transport mine with grips off always so its not an issue for me.  By all means if anyone wants to take a stab, PM me and I can send the F360 or Step.  My free form body skills in fusion are not ideal.

*Comment if you want some more sizes, or how it fits.