I printed my replacement for the Ring Grip out of PLA and glued it together with CA glue.
However, for the Handle Grip, you will definitely need print it using TPU.
Be forewarned that it's a bit tricky to slip the replacement grips in place, and you'll need a very thin spudger (I've included a photo of the tool I used) to help you pull the 'wings' on the backside of the grips into place.
The author marked this model as their own original creation.