Part 4070 differences in BI

[Peter Grass]

As mentioned in this old 2014 thread, the real life part and the part in BI have a side stud protruding over the regular 1x1 brick dimensions which was never implemented. It probably should be though since it would be easy to make a model that is unbuildable in reality due to this.

https://forums.ldraw.org/thread-12698.ht...light=4070

There are also a few other differences too in more modern revisions like how the internals are arranged and the internal circular hole depth. It also has those triangular parts which are likely to help hold a bottom stud a bit more securely.

On the right is the BI part and on the left is the ldraw one.  I've attached the latest version of the BI part.

[Chris Böhnke]

I assume part of that change has been made to prevent those "slotted" versions from appearing. The original geometry makes part of the front so thin, it had a high tendency to fully cave-in.

[Magnus Forsberg]

Mainly due to the difference between reallity and the ldraw standards.

An ldraw stud is 4 ldu high and have a diameter of 12 ldu
All studs in ldd data is 4.45 high and 12.5 dia.

To fix this we would need to redesign all parts, and make room for a taller and bigger stud.
Remember, you are not allowed to scale the stud primitive.

[Peter Blomberg]

As mentioned in this old 2014 thread, the real life part and the part in BI have a side stud protruding over the regular 1x1 brick dimensions which was never implemented. It probably should be though since it would be easy to make a model that is unbuildable in reality due to this.

There are also a few other differences too in more modern revisions like how the internals are arranged and the internal circular hole depth. It also has those triangular parts which are likely to help hold a bottom stud a bit more securely.

Those triangular parts are not intended to hold the stud from the brick underneath. They actually start at the height of the stud, so they shouldn't touch. Those were added to reduce warping. Such warping produced loose connections, which are highly undesirable in SNOT building.

The hole depth has been increased over time to make the front more durable as Chris points out. When I was young, the front bottom had a tendency to separate from the studded area of the front. The triangular parts also reduce the tendency of breaks in those corners.

Nothing prevents the current stud2a from being moved slightly in the z-direction. The inside is already extended by cyli and the outside can easily be fitted with a cyli collar at the base of the horizontal stud. We can fix this if we wanted to. While someone does that, it would be convenient to also fix the thickness of the front to allow a bar from below all the way to the inside top. Currently, it would clash with the front.

Perhaps something like this:

0 Brick 1 x 1 with Headlight
0 Name: 4070.dat
0 Author: James Jessiman
0 !LDRAW_ORG Unofficial_Part
0 !LICENSE Licensed under CC BY 4.0 : see CAreadme.txt

0 BFC CERTIFY CCW

0 !KEYWORDS headlight brick, side stud

0 !HISTORY 1998-06-20 [PTadmin] Official Update 1998-06
0 !HISTORY 2003-01-28 [sbliss] Completed header; BFC'ed; remeshed polygons
0 !HISTORY 2003-08-01 [PTadmin] Official Update 2003-02
0 !HISTORY 2007-06-30 [PTadmin] Header formatted for Contributor Agreement
0 !HISTORY 2008-07-01 [PTadmin] Official Update 2008-01
0 !HISTORY 2025-10-31 [WUIt] Fixed side stud and bottom bar connections

4 16 10 24 10 6 24 6 -6 24 6 -10 24 10
4 16 -10 24 10 -6 24 6 -6 24 -6 -10 24 -10
4 16 -10 24 -10 -6 24 -6 6 24 -6 10 24 -10
4 16 10 24 -10 6 24 -6 6 24 6 10 24 10
1 16 0 24 0 10 0 0 0 1 0 0 0 -10 recte3.dat
1 16 0 24 0 6 0 0 0 1 0 0 0 6 recte4.dat
1 16 0 22 -8 10 0 0 0 -2 0 0 0 -2 box2-7.dat
1 16 0 4 3 -6 0 0 0 -1 0 0 0 7 rect.dat
1 16 0 0 2 10 0 0 0 1 0 0 0 8 rect.dat
1 16 0 10 10 6 0 0 0 0 6 0 1 0 recte3.dat
1 16 0 12 10 10 0 0 0 0 12 0 1 0 recte3.dat
1 16 0 10 -6 10 0 0 0 0 10 0 1 0 recte3.dat
1 16 0 12 -4 6 0 0 0 0 8 0 1 0 recte3.dat
1 16 0 10 -4 4 0 0 0 0 4 0 1 0 4-4edge.dat
1 16 0 10 -4 4 0 0 0 0 -4 0 -1 0 4-4ndis.dat
0 BFC INVERTNEXT
1 16 0 10 -4 4 0 0 0 0 4 0 -2.45 0 4-4cyli.dat
1 16 0 10 -6 6 0 0 0 0 6 0 1 0 4-4edge.dat
1 16 0 10 -6 6 0 0 0 0 6 0 1 0 4-4ndis.dat
4 16 -6 16 10 6 16 10 10 24 10 -10 24 10
4 16 -6 4 10 -6 16 10 -10 24 10 -10 0 10
4 16 6 4 10 -6 4 10 -10 0 10 10 0 10
4 16 6 16 10 6 4 10 10 0 10 10 24 10
1 16 0 20 8 6 0 0 0 -4 0 0 0 -2 box2-7.dat
4 16 -4 14 -4 4 14 -4 6 20 -4 -6 20 -4
4 16 -4 6 -4 -4 14 -4 -6 20 -4 -6 4 -4
4 16 4 6 -4 -4 6 -4 -6 4 -4 6 4 -4
4 16 4 14 -4 4 6 -4 6 4 -4 6 20 -4
4 16 10 20 -6 6 16 -6 -6 16 -6 -10 20 -6
4 16 -10 20 -6 -6 16 -6 -6 4 -6 -10 0 -6
4 16 -10 0 -6 -6 4 -6 6 4 -6 10 0 -6
4 16 10 0 -6 6 4 -6 6 16 -6 10 20 -6
0 BFC INVERTNEXT
1 16 0 22 -5 6 0 0 0 -2 0 0 0 -1 box2-7.dat
4 16 10 24 10 10 20 -6 10 20 -10 10 24 -10
4 16 10 24 10 10 0 10 10 0 -6 10 20 -6
4 16 6 20 -6 6 20 -4 6 24 6 6 24 -6
4 16 6 24 6 6 20 -4 6 4 -4 6 16 6
4 16 6 4 -4 6 4 10 6 16 10 6 16 6
4 16 -6 24 6 -6 20 -4 -6 20 -6 -6 24 -6
4 16 -6 4 -4 -6 20 -4 -6 24 6 -6 16 6
4 16 -6 16 10 -6 4 10 -6 4 -4 -6 16 6
4 16 -10 20 -10 -10 20 -6 -10 24 10 -10 24 -10
4 16 -10 0 -6 -10 0 10 -10 24 10 -10 20 -6
1 16 0 0 0 1 0 0 0 1 0 0 0 1 stud.dat
1 16 0 10 -6.45 1 0 0 0 0 1 0 1 0 stud2a.dat
1 16 0 10 -6 6 0 0 0 0 6 0 -.45 0 4-4cyli.dat

[Orion Pobursky]

Altering a long established and fundamental primtive like stud2 is not in the cards. LDraw has tradeoffs and this is one of them.

I appreciate your strong desire to make things as real world perfect as possible. From what I've been told, James was the same way which, in my mind, is a great compliment.

[Gerald Lasser]

One more thing to consider is the inner height of a plate, which is currently at 4 LDU for most if not all plates. An extended stud would generate collisions if a plate is attached to a 4070