Print with no supports, upright. The original creator designed a custom support to avoid the Cura calculated ones, it just snaps off with some long nose pliers.
I used a 60mm/s print speed on my Ender 3 Pro, and the Standard Quality preset. This gets the print to 3 hours 14 minutes.
The author remixed this model.
I removed the hole for the additional threaded insert as I did not find it useful in my own use.
I also made the front grip taller as I found that when shooting, I wanted somewhere slightly higher for my middle finger to sit, and this also provides extra space for my fingers when not shooting.
Then, to make it fit just a little bit better, I added a small lip that fits just under/behind the screen on my X-T10, it does not interfere with the screen at all and results in a much more solid fitment.