This is an Angry Flexy Rex. It is a remix of user doctor.lex's Flexi Rex with stronger links.
Made some visual modifications to it (also shown on the pictures):

Angry eyes and eyebrows
Head bump
Nose
Bigger spikes
Fingers
Claws
Mouth or Tail keychain connection

The standard Angry Flexy Rex has five plates, sorted by size (scale 80%, 100%, 150%, 200%, 250%).
The mouth and tail keychain models both have two plates (scale 100% and 80%).
They can be scaled to other dimensions.

Dimensions:

Scale 80%: height 54.1 mm, width 65.07 mm, thickness 10.4 mm, filament amount 11.2 g
Scale 100%: height 67.62 mm, width 81.34 mm, thickness 13 mm, filament amount 18.9 g
Scale 150%: height 101.43 mm, width 122.01 mm, thickness 19.5 mm, filament amount 47.3 g
Scale 200%: height 135.24 mm, width 162.68 mm, thickness 26 mm, filament amount 91.9 g
Scale 250%: height 169.05 mm, width 203.34 mm, thickness 32.5 mm, filament amount 154.2 g

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Attribution:
This model is a remix of doctor.lex's Flexi Rex with stronger links ( https://**********.com/en/models/103585-flexi-rex-with-stronger-links#profileId-649833 ).
The doctor.lex model is a remix of Kirbs' Flexi Rex (Thingiverse thing:1759297), based on airfish's remix (Thingiverse thing:2189652). That model in turn was most likely inspired by the ‘Flexy Rex’ by zheng3 (Thingiverse thing:929413).

Note to anyone wanting to sell this:
You can sell prints of this model without having to ask explicit permission, but you must honour the Creative Commons - Attribution - Share Alike license. See the GitHub page for detailed instructions.

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