The original STL had a bunch of filleting applied to it which was making it difficult to modify when working backwards from a mesh conversion and I wanted to alter the feed lips gripping the front of the case more. That file probably works best with some stiffer filaments. I ended up grabbing a tikka mag stl off thingiverse and used that less complex wireframe conversion to get back to blocky corners to then design off instead (hope that makes sense). Features are still inspired by the original designer but this mag file is built off a different open source foundation now.
The petg glass fiber seems to be printing well and is as stiff / slightly stiffer than pla was and definately stiffer than regular petg. The tapered/rounded body fits pretty nicely in the bottom metal imho, I did a version with some knurling similar to the original file but I didn't apply it as high up on the magazine thinking it'd help stiffen the feed lip area. Takes a tad longer to print but not very much. I'm trying little tweaks here and there still on feed lips and some dims. The last version the last round rear would sometimes slip under the bolt face, so I pushed the feed lips back a little and want to see how that functions. Definately a little bit of a balancing act to grip the case body enough with the flexibility of these materials in mind yet not sinking the front of the case down too far so that it slips under the bolt face. Stiffer materials would help but I'm hoping for a design that is more user friendly for folks to mess around with and not require some of the higher end filaments.
If/when that is dialed in then it opens the door to mess with alternative springs if folks wanted to mess with that.
Do you got a printer to mess around with it? Seems feasible, just maybe some iterations on feed lips perhaps.
What I did above with reworking the mag body feels pretty good to my hand in terms of protrusion, what is your motivation/design consideration around completely flat?