I've designed this as a 150% model. 100% may work but I haven't tested that. Just a personal preference. 

I've made a few customisations to the original Dummy 13 model to make a General Grevious, as he is my favourite charater in the Starwars universe.

I purchased the original model for customisation from Lucky 13 toys (Soozafone) from printables:
[https://www.printables.com/model/1000024-dummy-13-design-files](https://www.printables.com/model/1000024-dummy-13-design-files)

I have tried to maintain the geometric feel of the original model, but capture the posture of Grevious. 
There are 5-6 items that I customised, and I have used 2 items from other users:
 

Lightsabers by Chubb_y:
[https://makerworld.com/en/models/1072595-dummy-13-lightsaber?from=search#profileId-1062781](https://makerworld.com/en/models/1072595-dummy-13-lightsaber?from=search#profileId-1062781)

Four arm mod by Monke23:
[https://makerworld.com/en/models/531614-4-arms-for-dummy-13?from=search#profileId-448463](https://makerworld.com/en/models/531614-4-arms-for-dummy-13?from=search#profileId-448463)

Please go download thier mods too to show support if you like this model!

To try keep it as close to Grevious as possible, I have re-coloured some of the items to match (feet black, hands in colour etc)
I printed all of mine in PLA as I did some testing, but I suggest the black parts be done in PETG for strength. 
I've added brims for a few of the parts, as I found they just print better.
The head is a bit tricky and I still had some drooping on the lower side, so feel free to adjust your support settings, you might know better than me. 

The assembly closely follows the original, but I have taken photos of a build to show the assembly here: