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LEGO Technic McLaren P1 (42172): Member Build

Set 42172
Pieces 3,893
Scale 1:8
Build time 8-9 hrs
Level Expert
Member build

3,893 pieces. One of the best subscriber photo sets we’ve had.

One of our members built the McLaren P1 (42172) and sent 17 photos. We picked the best ones. The set is the biggest in the Brick Club library right now, and these photos do it justice.

The P1 is a licensed replica of the McLaren P1 hybrid hypercar at 1:8 scale. The orange and black livery matches the McLaren MSO spec. The build takes a long weekend if you pace it sensibly.

Engine V8 hybrid, 12 moving pistons
Doors Dihedral (butterfly) – correct angle
Rear spoiler Active – deploys from front knob
Steering Working knob on front
LEGO Technic McLaren P1 42172 completed side profile member build
Completed build – side profile with info card. The MSO orange and black livery comes through clearly at this scale.

The V8 sub-assembly alone is a couple of hours. You can see 12 pistons moving through the rear once the bodywork is on. Most people spend a session just getting the engine block right before they start on anything else.

LEGO Technic McLaren P1 42172 completed with dihedral door open
Completed – dihedral door open. The mechanism opens cleanly in one motion, same angle as the real car.
The dihedral doors

The signature feature. They open at the correct angle with a single motion, and the mechanism is one of the most satisfying in any Technic set. This member got a clean shot of both doors up at once. Worth seeing in person.

LEGO Technic McLaren P1 42172 both dihedral doors open and rear spoiler deployed
Both dihedral doors open, active rear spoiler deployed. Push a button at the front and the spoiler rises at the rear.
LEGO Technic McLaren P1 42172 front nose close-up
Front nose. The proportions at 1:8 scale are accurate to the real P1.
Mid-build

These photos also show the build process before the body panels went on. If you are renting this one, this is what you are working towards. The chassis and engine sub-assembly are the bulk of the time.

LEGO Technic McLaren P1 42172 near-complete chassis mid-build side view
Chassis near completion – body panels not yet fitted. You can see the full suspension and drivetrain layout here.
LEGO Technic McLaren P1 42172 engine bay top-down detail
Engine bay from above. The V8 with 12 pistons is the mechanical centrepiece of the build.
LEGO Technic McLaren P1 42172 V8 sub-assembly in progress
V8 sub-assembly. A couple of hours on its own before it goes into the chassis.
LEGO Technic McLaren P1 42172 top-down aerial view completed
Aerial view of the completed model. Open roof cockpit and rear engine cover give you a full view of the interior layout.
Kit notes

The P1 is the biggest kit in the library at 3,893 pieces. It is an Expert-rated build. The V8 sub-assembly is the trickiest section; the rest builds logically if you follow the instructions in order. The dihedral door mechanism requires patience but pays off. Rated 8-9 hours for an experienced Technic builder.

In the library LEGO Technic McLaren P1 42172 product image
Kit specs
Set number 42172
Name LEGO Technic McLaren P1
Year 2024
Pieces 3,893
Scale 1:8
Difficulty Expert
Build time 8-9 hours

This is exactly why I like putting member builds on the blog. The official images tell you what a kit is supposed to look like. Member photos show what it feels like once someone has actually sat down, opened the bags, and worked through it.

If you have just finished McLaren P1, send over a few photos. It does not need to be a full studio setup. A clean table, a finished build, and a few notes on what stood out are enough.

Brick Club

Rent the McLaren P1 and send us your photos

Subscribers get one kit at a time, free post both ways, and as long as they need to build it. When they are done, it goes back and the next one ships out.

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Master BuilderUp to 12 kits a year
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