Marui Samurai 4WD - Another SilverTriple's journey...

[silvertriple]

Added one parameter, reviewed the slot internal diameter and it should be perfect now...



Edit : tweaked it so it become less obvious that the external ring is bigger...


I think I'll need to reprint those

[silvertriple]

It's a toss up between Bowden with a light print head but lousy retraction and direct drive that's heavier but tiny retraction , the thing that swung me to direct drive was the time it takes to do retractions , just try it on a long print in your slicer with a 7mm retraction or with a 0.5mm retraction , it saves loads of time , this means that a Bowden printing 80mm/p/s is not much faster than a direct drive at 60mm/p/s .
Also these days with the super light weight extruders like the Orbiter that I'm using a direct drive setup is not nearly as heavy as they used to be ! You'll probably have to design a mount yourself as the 5+ is not so popular , I had to design one for the Ender 5 as there was nothing exactly right on Thingiverse as I'm also using a Dragon hot end .

I just noticed the impact of the retractation on the long print for 4 wheels. I reduced a bit and the time is already noticeable.... Going to direct drive at the same printing speed (i'm currently printing at 60mm/s) will definitely change something...

[Dadio]

Yup , it's not actually printing faster but it's waisting less time for the same result , another thing you mentioned was going to linear rails , with the Ender 5 style printer there is already an extra stepper motor on the X axis making it heavier than a core XY printer , adding a linear rail will make it heavier still , I've been planning on fitting them to the Y axis as there's no weight penalty but I'm leaving the rollers on the X axis as it's lighter , I've even considered milling down the X axis 20/20 beam to reduce the weight further .

[silvertriple]

Yup , it's not actually printing faster but it's waisting less time for the same result , another thing you mentioned was going to linear rails , with the Ender 5 style printer there is already an extra stepper motor on the X axis making it heavier than a core XY printer , adding a linear rail will make it heavier still , I've been planning on fitting them to the Y axis as there's no weight penalty but I'm leaving the rollers on the X axis as it's lighter , I've even considered milling down the X axis 20/20 beam to reduce the weight further .

My brother is doing some stuff on bigger things powered by those same stepper motors. His take on them : they are able to cope with more weight without much issues, and he has converted his bowden printer to direct drive by just changing the stepper motor place for the extruder: and as per his saying, he's able to print much faster than 60mm/s with his configuration. At this stage with those issues I got recently, I didn't dare going faster than 60mm/s anyway. I may want to try this... The roller are accumulating dust, and this is my problem : cats in the house probably don't help for this : linear rails would be a substantial improvement for this reason... Ultimately, i'm still debating about upgrade or replace the printer:

• If I replace, criteria would be Dual extruder, high temp, closed, probably with a smaller bed/footprint.

• If upgrading : linear rails, Direct drive extruder (Biqu H2 V2 seems to be the right spot), Mainboard and touch screen?

I think that any case, there won't be a Mid for me this year

[Dadio]

Tough call a Mid or a better printer.....
It's not just the stepper motors it's more the rubber toothed belts that cause rebound and print artefacts , I print at 60 for quality , 80 for speed , up to 100 for prototype parts .
If you look at the fast core XY YouTube clips they even go to carbon fibre X Axis beams if they fit linear rails to save weight , they use monster stepper motors and very wide belts too .

[silvertriple]

Yes, tough call... I will have to choose

Print was launched yesterday and did last about 21 hours. I was a bit impatient to try out.


I let you judge of the trick...





I still have a minor change to do on the rear wheel (may be i'm a bit perfectionist), and it will be time to call it done (at least this is my hope )

[Dadio]

The look is quite effective , the Hotshot tires are fairly low profile to begin with so it might work even better with a high profile tire like the Kyosho Optima tires but the Hotshot tires are closest to the original tires that are commonly available , still it gives that optical effect nicely .

[silvertriple]

The print is done and tested, and it's now final.


Remain to extract the stl files for some of the wheels defined, in both friction and hex driver, and with some variant of size and number of spokes, and I'll upload them on Thingiverse at some point...
But not now. I'm exhausted

[Dadio]

The print is done and tested, and it's now final.



But not now. I'm exhausted

Brain cheese builds up fast in Fusion 360 , you need time for it to melt away
Looking good though , worth the effort

[silvertriple]

Milestone!!!
https://www.thingiverse.com/thing:5247223

A universe of rims for the Samurai is on thingiverse... Enjoy !

The print is done and tested, and it's now final.



But not now. I'm exhausted

Brain cheese builds up fast in Fusion 360 , you need time for it to melt away
Looking good though , worth the effort

Thanks! @Dadio , do not hesitate to contact me if you want details on the parametric stuff

[silvertriple]

As someone mentioned in one thread of another forum he was missing the G55 spacer for his Samurai, I took it from the box, modelled it and published it on Thingiverse...​​​​​​​
https://www.thingiverse.com/thing:5254556

[silvertriple]

As mentioned in the postman thread, I got a third Samurai today




It was in France, it was published on a picture on a group by the owner with the question about what it was... I had a chat with the guy, and he asked me what would be the value of it. I gave him the honest value, based on the pictures. My estimation was later on confirmed by some people who did not saw the exchange in the comments of the picture itself. The guy asked me if I was interested, and I could not say I was not. I told him I would buy it if I could, but unfortunately timing was bad for me... The guy asked about the good timing, and I told him March... And then it happened about one month later....

Marks of use underside, but beside this it is in very good shape. One of the rims has lost part of the chroming, but beside this they are nice... Complete, no missing parts. A good cleaning required... =

The Samurai have always been one my favorite cars, if not my favorite. And like the Hunter, it takes a very specific place here... And for the two other warriors that arrived today, I'll open a single thread when it will be time to start to work on them...

[silvertriple]

I was expecting to start rebuild one of the Samurai today... But there was an hiccup.
Ball bearings were ordered within the middle of the week, but there was some delays in the delivery for some of them. Which means there is no chance I'm getting the Samurai rebuilt this week-end...

[silvertriple]

While not having the ball bearings to start to build one a Samurai, it did not prevent me to work on the Samurai project...

I wanted to order wheels sls printed from one of the Asian providers which have currently a very interesting discount for first orders. The Samurai wheel set alone did not make the full cut of the discount. I decided to design a wing with Nylon SLS printing in mind (among the Samurais I got, 2 of them are complete with nice bodies, but the wings did not survive - I have to do something for my runner).




Once done, I ordered the wheels and wing in white SLS and can't wait to see the parts arriving.

While having 2 Samurai side by side, I took a picture of a difference I noticed


One of the gearbox is having a opening and a red door while the other one is not having anything. I remember one press article from a magazine in which they do advise to do a hole to ease the motor pinion change on the field. I believe the Samurai with the gearbox without opening is from a first generation while the second one from the iteration that followed (in which they took the feedback from the owners on the race field). This is quite interesting as it shows that Marui was taking customers feedbacks and doing something with it (there is other small/minor improvement made within the Marui cars that are interesting to see).

[silvertriple]

When I teared down to parts my first Samurai, I put all the parts in a box without cleaning them as it was late that day, and I did not have a chance to clean them up until today...

At that time I did not even too the time to completely unbuilt it: the front diff was still assembled and there is few parts in the rear gearbox still together (I did not remove the e-clips), and I needed to remove the white parts from the front arms...

I tackled the front diff first... Removing the screws is easy. Removing the metal bevel gear is easy on one of the side, but not on the second side. I took paper clips, folded them, and let's try...

By little steps, I succeed to get it out while killing two paper clips (need to think about a better solution for the other Samurais, as it is needed to do this in order to place ball bearings).


Then I took care of the front arms before putting them in the WD40 bath with the other parts...


Those clips are also difficult to remove (if anyone have an easy solution for this, I'm interested).

Anyway, parts are happily in the bath now