Fit very tight... My printer isn't 100% dialed in so I ended up over sizing to get it to fit which worked well
I printed in PETG I dropped rifle right on it no issues great simple design I just slip in dry erase cards to reuse or just use sharpie on as needed
Can't beat $free.00
Printed in clear PETG, scaled up 102% in cura to make it easier to slide onto rail. Folded 3x5 index card stays really well. It is the widest point on my rifle so it pokes my rifle bag a bit. No issues but thought I'd mention.
Took about an hour to print with Cura default settings for ABS, Seems like it should do the job just fine. Fitment was perfect, required no secondary finishing.
I had the "dope card holder" printed by a friend. great design, easy to make. Super nice to have offered for free. Stay safe.
Didn't follow the instructions the first time... my bad.. After that though it printed fine and works great!
Word to the wise, PLA is brittle, and seems more so in cold weather.