A skeletal framework example using derived parts, 1.2 Meg download. The placement of the front set of mounts  can be changed in two angles.  It is easy to break and also easy to repair.  All parts are controlled by a single part consisting of sketches and exported dimensions.

in process, Rx7 engine + mount & prop (not air worthy). 3.7Meg

FauncS403i Robot from Sean Dotson 4 Megabytes

ABB IRB 6400 Robot, (4 Meg), Spread Sheet driven.  Submitted by Andrew Pawelski

CAMCO 4 Position Rotary indexer(1.1Meg).  Submitted by Billy Young

Another example of Skeletal framwork. (1.9 Meg). It uses a base skeleton which contains all the geometric relationships and sizing. This is derived into the hex and pentagons which are finally assembled to form the ball.

Dial Indicator, no particular brand, about 2" Diameter by CBliss

Dial Indicator, Both hands move.  Open and move the end of part marker on all parts before opening the assembly. (1.6 Meg), by Dan Igrin.
Depending on the position of spindle (function “Mate_VAR”), both of its arrows can Point to the corresponding digit-indicator. This model can exist in a state of free motion by suppressing function “Mate_Var” for the spindle.

BobCat Skid Steer, 2.9 Meg Download,  This was sent by Vincent Moleno who is currently working on a new product (not shown) and is looking for investors.  The invention he is working on is ".. a land clearing device that will one day make bulldozers and excavators obsolete for that purpose ”
Email Vincent Moleno if interested.

Rear wheel for Motor Cycle less the Firestone logo. 1.4 Meg Download

Model Mania part

International Inventor Challenge (my entry) click for larger image or here for the model
The rendering was done with Presenter3D