This cradle fits perfectly with the Gunsmith Bench Block by isualum. Get it here: https://www.thingiverse.com/thing:3357369.

I have a Maple wood benchtop and my Gunsmith Bench Block was sliding around every time I wanted to use it. I made this cradle to prevent slippage.

I printed this with FlexPLA, but can be printed in TPU as well. NOTE: Flexible filaments need a very, very slow feed rate or it will clog in the nozzle or bunch up at the extruder. Please let me know if this helps you out at all and post pictures of yours!