More than a year ago I printed a tf2 sentry (the red one in the pictures) and while it is really cool, having to glue everything was pretty tedious. Over time it also has completely fallen apart.
After a lot of procrastination I've finally finished my custom sentry that can be fully assembled without having to glue anything! I've just gone off of a couple pictures and the model that I printed so it isn't super accurate but the iconic look is definitely there.
Print one of everything except for the bolt, you'll need 2 of those.
For every piece it should be pretty obvious how it can be printed, some pieces need a little bit of support material.
The gun can be printed pointed up, so that the hollow part can be covered using bridging. Only the slit in the nozzle needs a tiny bit of support.
For me everything fit together without any sanding though most fits were very tight.
The author hasn't provided the model origin yet.