Status: Finished | Last updated: 2/10/18

I'm a big fan of Dodge Roll's game called Enter the Gungeon. The Bullet Kin has this aloof look about them that reminds me of Servbots from Mega Man Legends. Although not a very practical design, I wanted to both model a Bullet Kin and make an attempt at threads with FFF printing. The idea was to have the bullet unscrew from the shell with a hollow section to store items. I also wanted to avoid painting, so the model was designed for multiple parts to be printed and connected together. Reference Photos

The design of the Bullet Kin varies a lot, even between in-game action and the enemy index. Official Dodge Roll art gives them a totally different persona, but it's a very simple design to work off of. There are different types of Bullet Kin in the game as well, but I stuck to the basic model.

Modeling

The model is all just modified cylinders and cubes, again a simple design to make. The body is a cylinder with a loopcut scaled down a tad with a hollowed extrusion to make the cavity. The eyes and mouth were modeled from a cylinder and cube, respectively. Boolean intersection modifiers were used to give the face parts a matching curve with the body. Boolean difference modifiers to create the holes to place the face parts. The threading was the hardest part, mostly because I've never done threads in Blender before. I followed the steps in the first part of this video by 3D Printing Professor. The subject isn't about threads, but he makes a simple re-creation of a threaded object. I used that as a guide. Note that if you do a lot of threads you'll likely want to use a CAD program that includes presets for them.

Printing

The print came out alright, the threading is functional. The eyes and mouth, printed separately, requited a little sanding, but can just be pushed into place. The cap was printed upside-down, to test the new cooling fans, and it came out better than expected. The line down the middle of the face is the overlap the printer makes when ending a circle which I'll need to turn down to resolve.