File is pre supported at optimum printing angle for strength. Allow slicer to generate additional support as necessary, unless you have a well tuned printer.
You'll also need to file the nose of the mag follower as shown, this can be done with a small round file. This prevents the follower from catching the lower edge of the forward spine inside the Pmag body when the follower travels up and down past the part line.
The author remixed this model.
Like the Pmag +15 but smaller.
Fits Pmag Gen3 and accepts oem baseplate and locking plate. Parts are secured with one M3x5 socket head bolt.
As the mag body was shrunk in height for this remix, I noticed the lips came closer to being longitudinally inline to the layer lines which induced a propensity to cracking if the mag body was mishandled or improperly fitted during post print processing.
Model is now pre-supported, and oriented at an angle on the build plate so the layer lines run across the upper and lower lips at an angle. This reduces the likelihood of cracking during fitment to Pmag host mag as well as during drops and accidental shock during use.