About SR3D Builder modeling software

I have been using SR3D Builder to create my digital models after finish my real models from more than 5 years.

I use it because in my opinion it is the best software to create technic models. You can do more things and it has more parts than LDD, and it is easier, more intuitive and quicker to build than MLCad.

Also its 3D models files are compatible with all LDraw tools(MLCad, LDview, etc).

Solar system Orrery with 8 planets

We are only a very small living beings in a huge universe. We live in a small planet called Earth in a group of 8 planets called Solar System, with our star in the center, the Sun.

Tips and Curiosities: Power Functions

The LEGO Power Functions system has more possibilities and hidden functions than you probably think.

I will show you a few examples. Some of them are well known, but others don't.


You can use a 9V train controller to connect any Power Functions element.

To do it you only need to add an empty battery box between the controller and the IR receiver

Mercedes-Benz Arocs 8x8 chassis (unfinished MOC)

With the new big Technic set 42043 Mercedes-Benz Arocs coming to the stores I want to share my unfinished and abandoned Arocs.

Two years ago a Mercedes Trucks dealership in Spain asked me about built a Arocs 8x8 for them in big scale. When I had the chassis finished they decide don't buy me the truck, so I stopped the development, but I kept the chassis assembled because I didn't need the parts for other projects.

This is what I built (the chassis has tons of dust... but after two years on a shelf is normal ;) )

Car Lift

I have had some free days to do a little MOC after many weeks of intense work ;)

It is a car lift with 2-columns like the mechanics use in in the garages.

Kamov KA-32 Coaxial helicopter

After many cars and other land vehicles, now its time to build something different.

This creation is based in the Russian helicopter Kamov KA-32.

This helicopter has the peculiarity that it has two coaxial rotors turning in opposite directions, instead of the traditional main rotor with a small tail rotor.

Alternative parts for rare soft axles

I want to talk about a big problem when you create a technic MOC: the soft axles.

They are very usefull to create soft curves, corners and transitions in technic models, specially in the bodywork, but as probably most of you know, the soft axles have a big availability problem.

Sequential gearboxes family

Today is the third anniversary of this website!!

And for celebrate it I will show you many information about all my sequential gearboxes until today.

With my latest cars (Caterham Seven and Shelby GT500), I have introduced a new sequential gearbox type, and to avoid problems with how to call this new one, I decide add a new way to call all of them.

Since now the new versions of the sequential gearboxes will be called with ordinal numbers. In this ordinal numbers don't enter other gearboxes types like: dual clutch, planetary or CVT, just normal sequential gearboxes.

MPS. Rear axle VI: Multi-link (4 links)

Following the idea of an anonymous reader

With drive (code: R.ED)

- R.ED.1.1 - Push-rod

Standard: Yes
Max shock adsorvers allowed: 1
Advanced suspension geometry (Camber angle): Yes

MPS. Rear axle V: Torsion-beam

Following idea by Zachary Cross

Without drive (code: R.D)

- R.D.1

Standard: Yes
Max shock adsorvers allowed: 1, it can use hard spings, but works better with soft springs.
Advanced suspension geometry (Camber angle): No

MPS. Rear axle IV: Live axle with leaf spring

Following the idea by legomuppet9.

With drive (code F.CD)

- R.CD.2

Standard: No, it need a big hole in the chassis for the drive shaft.
Max shock adsorvers allowed: None, supported by leaf spring under the axle
Advanced suspension geometry (Camber angle): No

Remote controllers with instructions

Many people have asked me about the remote controller I use to control my supercars.

My usual remote controller is a triple controller, it is made with 3 normal PF remote controllers joint with some added elements to make it easier to use.

MPS. Front axles V: Double wishbone with Lego hub I

Note: Lego hub is this part x873c01

With drive (code: F.CD)

Type 1

- F.CD.1.1A - Pushrod A

Standard: Yes
Max. shock adsorvers allowed: 1
Space for an auxiliary transmission under the axle: Yes
Easy conversion to right steering wheel: Not necessary, steering transmission in the center
Advanced steering ans suspension geometry:
- Ackerman steering: No
- Camber angle: No
- Caster angle: No
- Kingpin inclination: No

MPS. Front axles IV: Double wishbone II

With drive (code F.BD)

Type 2

- F.BD.2.1 - Pushrod

Standard: Yes
Max. shock adsorvers allowed: 1
Space for an auxiliary transmission under the axle: Yes
Easy conversion to right steering wheel: Yes
Advanced steering ans suspension geometry:
- Ackerman steering: No
- Camber angle: Yes, varibable with suspension position
- Caster angle: Yes
- Kingpin inclination: No

MPS. Rear axles III: Double wishbone with Lego hub

Note: Lego hub is this part x873c01

With drive (code R.BD)

Type 1

- R.BD.1.1 - Pushrod

Standard: Yes
Max shock adsorvers allowed: 1
Advanced suspension geometry (Camber angle): No

MPS. Front axles III: McPherson II

Without drive (code: F.A)

Type 1

- F.A.1B

Standard: Yes
Max. shock adsorvers allowed: 1
Space for an auxiliary transmission under the axle: Yes
Easy conversion to right steering wheel: Not necessary, steering transmission in the center
Advanced steering ans suspension geometry:
- Ackerman steering: No
- Camber angle: Yes, variable changing the axle 3L with stud that hold the shock absorver
- Caster angle: Yes
- Kingpin inclination: Yes

MPS. Rear axles II: Live axle

With drive (code F.CD)

- R.CD.1

Standard: No, it need a big hole in the chassis for the drive shaft.
Max shock adsorvers allowed: 3
Advanced suspension geometry (Camber angle): No

Notes: The green liftarm on the axle means that the axle need a support to keep the structure enough strong, but you can put this support anywhere you want in the top.

MPS. Front axles II: Double wishbone I

Without drive (code F.B)

Type 1

- F.B.1.1 - Pushrod

Standard: Yes
Max. shock adsorvers allowed: 1
Space for an auxiliary transmission under the axle: Yes
Easy conversion to right steering wheel: Yes
Advanced steering ans suspension geometry:
- Ackerman steering: No
- Camber angle: Yes
- Caster angle: Yes
- Kingpin inclination: Yes, very light, variable

MPS. Rear axles I: Double wishbone I

Type 1

- R.AD.1.1A - Pushrod A

Standard: Yes
Max shock adsorvers allowed: 3
Advanced suspension geometry (Camber angle): Yes, variable along the suspension position

MPS. Chassis I

- Unibody Type1 (C.A.1)

Standard: Yes
Wheel base: 29-38, changing the red liftarm (you can use the color you want ;) )
Width: 21-25, changing yellow liftarms
Strength test:
 - Central load: 8/10
 - Torsion load: 5/10