ORIGINALLY MADE BY JulienJeanroy 

https://www.thingiverse.com/thing:4342323

Summary

https://youtu.be/gaZWjItCFYg

My take on Gary Fay's articulated fingers extentions.
I've made the fingers as thin as I could so I can add differents 3d printed skins later (like a skeleton skin, a monster skin, an evil witch skin, etc.).

I know the thumb isn't suppose to have that many phalanx but I thought it was spookier like this.

Those are custom-made for my hands so you'll have to adapt them for you.

My hands (length of fingers from inner webbing to the top) :
• Thumb 70mm
• Index finger 80mm
• Middle finger 85mm
• Ring finger 85mm
• Pinky finger 60mm

Width of my fingers are around 20mm.

I used filament for all the axis. Easy to cut to any size needed. Burn each end and squeeze them.

Edit:
• 17/05/20 Updated MF_Pha_A, PIN_Pha_A and THUMB_Pha_A
• 24/05/20 Uploaded the skeleton skin : https://www.thingiverse.com/thing:4391928
• 24/05/20 Uploaded the files used to create a skin: https://www.thingiverse.com/thing:4392074
• 30/05/20 Uploaded the Fusion 360 file

PARTS YOU'LL NEED TO PRINT FOR ONE HAND :

5X Axe
5X Gear_A
5X Gear_B

3X MF_Pha_A
2X MF_Pha_B
3X MF_Pha_BF_Base
3X MF_Pha_BF_Top
4X MF_Pha_C
1X MF_Pha_D_Top
1X MF_Pha_D_Base
2X MF_Shaft_A
2X_MF_Shaft_B

1X IND_Pha_B
2X IND_Pha_C
2X IND_Pha_D_Top
2X IND_Pha_D_Base
1X IND_Shaft_A
1X IND_Shaft_B

1X PIN_Pha_A
1X PIN_Pha_B
1X PIN_Pha_BF_Top
1X PIN_Pha_BF_Base
4X PIN_Pha_C
2X PIN_Pha_D_Top
2X PIN_Pha_D_Base
1X PIN_Shaft_A
2X PIN_Shaft_B

1X THUMB_Pha_A
1X THUMB_Pha_B
1X THUMB_Pha_BF_Top
1X THUMB_Pha_BF_Base
1X THUMB_Shaft_A

1X Wrist

PARTS FOR EACH FINGERS :

Thumb :
1X Axe
1X Gear_A
1X Gear_B
1X THUMB_Pha_A
1X THUMB_Pha_B
1X THUMB_Pha_BF_Top
1X THUMB_Pha_BF_Base
1X THUMB_Shaft_A
2X PIN_Pha_C
1X PIN_Pha_D_Top
1X PIN_Pha_D_Base
1x PIN_Shaft_B

Index finger :
1X Axe
1X Gear_A
1X Gear_B
1X IND_Pha_B
2X IND_Pha_C
1X IND_Pha_D_Top
1X IND_Pha_D_Base
1X IND_Shaft_A
1X IND_Shaft_B
1X MF_Pha_A
1X MF_Pha_BF_Base
1X MF_Pha_BF_Top

Middle finger :
1X Axe
1X Gear_A
1X Gear_B
1X MF_Pha_A
1X MF_Pha_B
1X MF_Pha_BF_Base
1X MF_Pha_BF_Top
2X MF_Pha_C
1X MF_Pha_D_Top
1X MF_Pha_D_Base
1X MF_Shaft_A
1X_MF_Shaft_B

Ring finger :
1X Axe
1X Gear_A
1X Gear_B
1X MF_Pha_A
1X MF_Pha_B
1X MF_Pha_BF_Base
1X MF_Pha_BF_Top
2X MF_Pha_C
1X IND_Pha_D_Top
1X IND_Pha_D_Base
1X_MF_Shaft_A
1X_MF_Shaft_B

Pinky finger :
1X Axe
1X Gear_A
1X Gear_B
1X PIN_Pha_A
1X PIN_Pha_B
1X PIN_Pha_BF_Top
1X PIN_Pha_BF_Base
2X PIN_Pha_C
1X PIN_Pha_D_Top
1X PIN_Pha_D_Base
1X PIN_Shaft_A
1X PIN_Shaft_B

Print Settings

• Printer brand:

Prusa

• Printer:

i3 MK3

• Rafts:

No

• Supports:

Yes

• Resolution:

0.15 mm - Quality

• Infill:

15%

• Filament brand:

Amazon Basics

• Filament material:

PLA

• Notes:

Full support only for Gear_A /
Support from build plate for Shafts, Gear_B, Axe, Pha_As and Pha_Bs /
Print Pha_As and Pha_Bs vertical

How I Designed This

Observ -> Think -> Design -> Model -> Print -> Restart

I use reference pictures and videos for starters. Retro-engineered the mechanic. Designed pieces on Illustrator. Modeled them on Fusion 360. Back and forth till I got one finger figured out. Then adapt the model to each of my fingers.