RoboForce Sentinel Action Figure

This is a from-scratch rebuild of the RoboForce figure Sentinel. It's about ⅔ the original scale. There's no pneumatic arm action, but I did include the button in the back that uses a ballpoint pen spring and the arms can bend inward using black or grey pipe cleaners. 

Almost all other parts are single-color prints that can be assembled. The main body with black eyes can be printed with a multi-color printer or just printed white and painted by hand later. Glue is needed for the shoulders, shoulder pegs, hands, weapons, and the spring for the back button. Everything else friction-fits together. 

Parts are oriented for printing and comments on each part indicate if a brim or support is needed. 

Back Button/Trigger:

Cut a ballpoint pen spring down to 10mm in length. Squeeze one end slightly so that it friction presses into the black button piece. Then use a bit of super glue in the top of the body to hold the other end of the spring. Be careful not to glue the button itself to the body!

Arms:

Each arm will be need four of the Arm Segment pieces, one Elbow, two Hands (Top and Bottom), and two Shoulders (Front and Back). The two parts of the shoulder and hands can use small pieces of filament in the small holes to align them when gluing together later. It's easiest to add the pipe cleaner around the internal slots before gluing them together.

The Arm Segments have a slight angle, allowing the arms to bend inward. Thread a black or grey pipe cleaner through two Arm Segments, one Elbow, and two more Arm Segments. Loop the top (not separated side) around the Hand interior peg. Loop the separated ends of the pipe cleaner around the peg of the Shoulder end to hold it together, with a little slack to allow the arms to bend later. Then glue the shoulder pieces and hand pieces together. If you find you have too much slack, twist the hand or shoulder 1 or 2 times to tighten it up.

Pop-Up Head Hatch:

The hatch in the top of the head opens and closes freely. It's connected using a piece of 1.75mm filament through the main body. Just run the filament from one side through the interior and back out the other side. Clip the filament flush on the sides and add a small dab of glue to the outside to keep the filament in place. Be careful to not get glue into the joint on the Hatch part! The Head Hatch should freely flip open and stand in place.

Weapons:

All three weapons use the same Weapon Handle piece. It can be a tight fit and these are small parts so be patient and use enough pressure until they slot together. The Hook and Star pieces have small holes for 1.75mm filament to align them. But honestly, they're so small that I just glued them together without the guide parts. The Weapon Star piece requires supports, but the Hook and Head Blaster should print without.

Colors:

Sentinel's hands and shoulders were tricky to find a good color match. The best I found, which is pictured here, is Sunlu Light Gold PLA filament. You could use yellow but that just looked too bright when I tested it out.

Chest Logo:

The Chest Logo.png can be printed onto either paper or a silver inkjet sticker sheet. You'll need to resize the Chest Logo to 33.44mm high by 19.7mm wide. I used the free Silhouette Studio software to resize and print it with exact measurements. Once printed, cut it out and glue it onto the body. Even if you use sticker paper, I've found adding gluestick to the edges helps it stick better over time. I also sprayed two layers of clear matte or gloss spray paint over the sticker to prevent smudging before applying it.

RoboForce Figures (so far):

• SOTA

• Hun-Dred

• Coptor

• Enemy

• Wrecker

• Vulgar

• Maxx 25

• Cruel

• Sentinel

• Blazer

Bases:

• Tank Base

• Rocket Base

• Magnet Base

• Spider Base