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I know this is a bit of heresy, but I've seen some people using various custom parts like tyres, rims, pneumatic actuators etc.

This is my attempt at shrinking front axle suspension:

I started by shrinking 15459/31794 and 2739a

hfvoZ5Cm.png jxusfATm.png

And then I made a liftarm with teeth to replace functionality of 6574 so it doesn't need to lay on system bricks:

yl2awSvl.png
 

I need to figure out some kind of neat rear axle to match this, but it feels like I won't be able to have independent rear suspension without making some over the board custom elements and I wouldn't want to go that far.

The steering arm and liftarm with gear rack can be found here: https://grabcad.com/library/lego-technic-compatible-front-axle-suspension-parts-1 (I'll try to upload it to thingiverse, someone noted it already that it's better because you don't need to log in to download).

I'm re-doing the rod as I used someone else's design from here: https://www.thingiverse.com/thing:3210100 and the connection on the ball is pretty loose.

Hopefully this is interesting :)

Edited by SaperPL
Consolidating topics on 3D printed parts

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Steering rack ir really good engineered. I like it.

But here we also see one main issue with these narrow axles - they are almost impossible to firmly connect to chassis. There then should be also some cusom, frame type part to do this.

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16 hours ago, SaperPL said:

And then I made a liftarm with teeth to replace functionality of 6574 so it doesn't need to lay on system bricks:

 

6574 does not need system bricks to work, just a flat surface

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1 hour ago, 1974 said:

6574 does not need system bricks to work, just a flat surface

This is true when you are using it with longer rods, but here it means when putting this on top of a liftarm, the bals joints would be vertically offset from the plane in between the attachment points of steering arms, so this would distort the steering as being lower would mean the steering links would make wheels come inward when suspension is released and outward when suspension is pressed.

The second issue is that 6574 or even this piece would freely move on a forward axis, so while 6574 used with longer rods is okay to move a bit front to back if secured a bit from the front, for a small setup like there's no place in front of it to secure it with something blocking it off.

17 hours ago, efferman said:

i like the steering rack

 

2 hours ago, Jurss said:

Steering rack ir really good engineered. I like it.

 

Thanks!

2 hours ago, Jurss said:

 But here we also see one main issue with these narrow axles - they are almost impossible to firmly connect to chassis. There then should be also some custom, frame type part to do this.

Actually I ran out of longer axles for this build and tried to simplify it without hiding the functionality. My previous video shows how overcomplicated it could be. Anyway there is a liftarm 3L positioned vertically where you could mount a longer one or simply you could use 7L axles instead of those 5L with stops to have more connection points. but yeah, I get that, but I got used to the fact that with those small builds, you need to sometimes reinforce the frame with the body above the steering to have a solid construction.

If you have any ideas for some custom parts, you can throw those at me, I can try to figure those out for printing. Also you can use Studio's part designer to put together pieces of existing parts by importing pieces from library, shaving them off with eraser from what you don't need and putting them together into a single new part. Using eraser on some technic parts is glitchy, but you can make a point or show what you mean better with those at least.

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I made a quick build from some leftovers to test it:

 

I have also created thingiverse account so you can download the custom part files to print without grabcad account.

You can find the source files from Solidworks and STL files for printing here: https://www.thingiverse.com/thing:4800409

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Very interesting parts! 

But if I did them, I would make the arms and links 1 stud longer for comfortable using in 42093 scale.

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1 minute ago, NoEXIST said:

Very interesting parts! 

But if I did them, I would make the arms and links 1 stud longer for comfortable using in 42093 scale.

Thanks!

I did it this way because that's generally the scale I'm used to with my small models, but yeah, it would be cool to have this part in different sizes.

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I did another custom 3d printed piece:

This is a small scale, front wheel drive GoKart build made to show off a new custom 3d printed piece that I made.

 know this is a bit weird construction for a GoKart, but it's meant to be a simple build showing off the steering hub. Also 4WD wasn't really an option without a differential between the front and rear axles as there's slight difference between front and rear axles rotation when turning that causes resistance when doing so.

You can download the STL file for print here: https://www.thingiverse.com/thing:4806746/files

Please note that with CV-joints instead of standard universal joint, the custom hub could have an axle hole, would hold the wheel more firmly and be a bit more universal. I will revisit this idea when I get some CV joints for testing.

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I've got some CV-joints, but I don't really like their limited bend angle so I'm sticking to universal joints.

I've made an improved version of my the custom 3d printed hub to be used with bigger wheels:

In previous design the wheel axle was held just by universal joint which wasn't perfect. For bigger wheels, I had to improve it by adding some material to hold the axle properly. Without the rim tightly enclosing the hub, the bigger wheel will wobble a lot on the old hub.

You can download the STL file for print here: https://www.thingiverse.com/thing:4859345/files

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I'm consolidating my 3D printing topics in this one to keep track of it. Future releases will go into this one.

On 5/19/2021 at 5:42 PM, SaperPL said:

You can download the STL files for print here: https://www.thingiverse.com/thing:4863373

On 7/23/2021 at 8:39 PM, SaperPL said:

I really don't like how Lego is making medium sized Technic rims, so I tried designing my own rim.

STL files for printing: https://www.thingiverse.com/thing:4915002 (still not finalised design though)

 

 

On 7/26/2021 at 9:04 AM, SaperPL said:

I printed the arms yesterday but it took me some time to make the video:

Files for printing, including new version of the wheels: https://www.thingiverse.com/thing:4916659

There are also studio files with sockets setup for testing in studio.

If you have any ideas on parts that could be designed or simply have a problem that could be solved with custom part, let me know here, I might be interested in designing it.

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That looks quite useful! I suppose it would be possible to make a similar one that would have the axle on one side and a standard Lego half with the axle hole on the other?

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6 minutes ago, 2GodBDGlory said:

That looks quite useful! I suppose it would be possible to make a similar one that would have the axle on one side and a standard Lego half with the axle hole on the other?

Sure, but you're kind of getting into CV-joint territory with this, except CV joint has terrible angle of operation.

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