After assembling my blaster I found the pieces were loose and rather than glueing them I wanted a single model which I could then split, and join with a squad plug. I've also since printed a single piece, which printed fine with a brim (I did not try without).
I then found that it was still a bit loose as the model was too short, so I extended the front by 1mm for a perfect fit.
The author remixed this model.
Joined parts C1(x4) and C2 into a single model and extended the front by 1mm.