(Note: this is an independent app, not affiliated with or endorsed by any companies who make these parts)

Do you own set 42078 and would like to build some other models besides the two basic ones?

Printed instructions for MOCs can be annoying, especially when you can't see where parts should go. Imagine if you could zoom in and see your MOC from any angle. Now you can!

Here are interactive 3D building instructions to build more MOCs from set 42078 using pieces all available within that set.

You can build a rocket (one metre tall), Kei tipper truck (with working tip-tray), potted plant (with opening flower), golf cart (with working steering and doors) and lawnmower (with adjustable height, moving piston and removable grass-catcher)

The interactive 3D can be moved to any angle, zoomed in and out. Lighting is also adjustable, as well as other features such as "ghosting" of previous steps and steps to be done, so you will always know where you are up to and can see where parts should be placed.

MOCs included:

Rocket (797 parts)
Opening cargo bay (via linear actuator).
Cargo: a satellite whose antennae open to catch better signals in space
Easily attachable/removable entry ladder and gantry
Three folding space-beds
Two functioning doors
Three habitable levels, with ladders between
Two lower levels, for MOC-makers to expand the model and add fuel tanks

Kei tipper truck (475 parts)
Actuator-driven rear tilt tray
Working rear tailgate
Rotating front bull-bar
Cabin rotates to reveal engine
Engine fan connected to rotation of rear wheels
Steering wheel connected to front sheels
Opening doors (that also 'lock' when closed)

Potted plant (324 parts)
Removable 'pot'
Removable 'soil'
Petals are open-able/posable via a linear actuator, activated by a 'Hand-Of-God' cog

Golf kart (325 parts)
Movable steering
Working doors
Under-seat storage
Set of golf clubs too
Fundamental suspension

Lawnmower (315 parts)
Adjustable cutting height
Moving piston
Piston is linked to cutting blade
Open-able engine hatch cover
Moveable grass flap at back
Removable grass-catcher
Open-able hatch on grass-catcher
Move-able throttle cable

Additional, experimental model:

Kiddie ride (220 parts)
Transportable
Rotating arms with exciting bump for passengers