I ended up getting a FDE plug for a compact Dagger and a FDE magwell for a Full-Size S Dagger from this debay seller
LINK. I'm in FL, ordered them Monday and received them via USPS from PA on Friday. The magwell was $20, the plug $7, shipping was $5 and combined.
They are 3D-printed out of glass-reinforced nylon which feels similar to what the Dagger is made out of. The material is hard with a tiny bit of "give". Overall, they are very well made, with stepped layering that provides a decent amount of grip, but are not sharp. The color match is excellent. Note that you can only install either the plug
or the magwell, not both. They are held in place by a small set screw that doesn't clamp anything but acts as a dowel. I turned them in with minimal torque until they just cleared the back of the grip.
The compact is currently not being used so I took it out of storage to install the plug. With a jeweler's file, I cleaned off a couple miniscule dribbles and drabbles from the 3D-printing. No one would ever see them, but I would "know" they are there...
The exposed texture was not sharp at all so I left it alone. It popped snugly into place--the screw makes sure it stays there.
After cleaning a couple tiny dribs and drabs (flash?) from printing with a jeweler's file, I popped the magwell into place. It "hooks" in the front of the grip and a tab pops into the back void of the grip. It popped in place and stayed there while I tried MagPul 17 and MagPul 21 mags in and out of it. Mags fed fine and the 17 fits flush as shown, 21 sticks out a little. There are no reliefs cut to grab the 17, so no grabbing and yanking out but they drop free with the release pressed. 21s are easily grabbed. These pics are before I pulled the magwell back out and did a little smoothing on the inside. I left the outside textured. It does make a nice little pinky rest.
I want to note that the only Glock 17rd mag I have does NOT fit in this gun. It doesn't go in far enough to engage the release because it bottoms on the frame. It is a Gen3 or earlier. I didn't even try it with the magwell. I'll post about it a different post...
Here is after cleaning the flash and smoothing the inside of the magwell with a jeweler's file, some 220 and 600 grit. Then I installed it and blended the magwell to the frame. Installing required a little pressing into the frame to get the screw hole/dowel to line up and I consider this a good thing. The magwell fits very tight and precise. I blended it to make it OCD perfect but you could probably get by just fine installing it as it is.
It may not "appear" smoother but it IS richard-rubbingly-smooth.
This is the gun before and after (but before smoothing and the dowel install). I'll post about the Full-Size build when I am "done" with it. There is a lot to talk about. Still have to check range function of the warranty slide and sight in the RDS before next weekend. This gun already ran a match with the black slide 3 weeks ago. You might still be able to see the carbon near the muzzle from 150+ rounds...
