This is an arrow squaring jig which is used when making (cutting) your own arrows. It's used to square the arrow before installing the insert for the arrow.
You can print it in anything PLA is what I use and works just fine.
You need to add the sandpaper, grit is up to you but it needs to be fairly coarse.
No need to print with support just print it just as it would sit and it will print fine.
It has screw holes for mounting it to a work surface. I have mine mounted on the board for the arrow cutting jig which is one of my other models.
This model is also published in my Thingiverse profile.
The author marked this model as their own original creation.