3D printable Cromwell Mk. IV in scale 1/16

This section is for builds that are not strictly Tamiya or Heng Long. For instance, replacing the electronics from a WSN or Matorro, or even a scratch-build.

Postby 50koruny » Sun May 16, 2021 3:18 am

Hi,
after all those Hetzers, I finally have a new project.
I am always learning new things and improving.
I'd like to show it on my Cromwell.
The Hull is ready, waiting for test prints and assembly.

I have developed a new type of 3D printed belt tensioners. They perform a rotary movement.
Two different rings and three types of motors can be used to rotate the turret.
Have 22 moving parts like hatchets and machinegun right now.
I care about every detail.I always try to create the most accurate model.

Cromwell will be available like KIT or STL files for 3D print as soon as I finish the tests.
I will bring new info and photos soon.

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Postby 50koruny » Sun May 16, 2021 3:19 am

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Postby square4 » Sun May 16, 2021 6:36 am

Looking very good, must watch out for updates. :clap:
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Postby Exhibitedbrute » Sun May 16, 2021 8:33 am

Put me down for a file and or kit when it’s done

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Postby tomhugill » Sun May 16, 2021 8:41 am

I love the look ofr this! Would you consider selling individual items like fire extinguishers, smoke launchers etc separately?

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Postby Kaczor » Sun May 16, 2021 9:09 am

Looks great. White parts are resin printed also?
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Postby Model Builder 4 » Sun May 16, 2021 11:55 am

Very nice work, look forward to seeing the first one roll out. As Tom already asked, will you be supplying any parts separately ? as I would also be interested :thumbup:

Cheers,Lee.
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Postby 50koruny » Sun May 16, 2021 12:35 pm

Thank you,guys.

Of course, separate parts will be available.
Actually, most of them are available even now.
Send me a PM for this, please.

Kaczor - white parts are printed with ASA.This is Fillamentum ASA Natural.
It looks so smooth, because its printed with activated ironing.
Well tuned FDM printer (4Max pro).
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Postby Biasphere1 » Sun May 16, 2021 2:50 pm

Mad skills 50Koruny mad as . A lot of credit to you and the guys who make files and move our 3D printing world forwards, kudos .

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Postby 43rdRecceReg » Sun May 16, 2021 9:11 pm

Looks very promising indeed. :thumbup:
I'm with Tom on wishing to be able to buy some of the individual (pre-printed) components: including tools, detailed parts etc. :thumbup:
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Postby Xiaoshan_Sailor » Sun May 16, 2021 11:21 pm

Following with interest and looking forward to your kit, Tomas. :thumbup:

Given Attracks is interested in developing metal track & sprockets for your new Cromwell, this will be a home run in new kit offerings for 2021.
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Postby B_Man » Mon May 17, 2021 10:13 am

Fantastic work :thumbup: I will be very interested in a kit when you get them rolling and one day I might even find some spare time again so I can build it. :D
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Postby Will01Capri » Tue May 18, 2021 12:14 pm

following with interest
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Postby 50koruny » Wed May 19, 2021 10:36 pm

Thanks, guys.
The hull is almost complete.
Have to reprint engine cover, but its normal, when i make prototypes.
Almost all parts on the pictures are at least version 2.
CAD files have even 6 or 8 versions before first test print.
Its big assembly with hunderds of parts, so i am unable to catch all problems in PC.
Nevertheless, prototype is growing fast.Going to prepare that tracks finally.


I have a lot of photos.I dont want to spam all that big pictures here.
If you want to see them, use this link.Attaching only one picture for the illustration.

https://photos.app.goo.gl/ihL5W4tYs2xAdBns7

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Postby Xiaoshan_Sailor » Wed May 19, 2021 11:39 pm

Very nice! Just ran through your photo gallery. :thumbup: :thumbup: :thumbup:

Aside from fasteners bearings & shafts, what metal parts, if any, will come with the kit?

Also could you offer some details on how you plan to employ a track tensioner? That tends to be a sticking point for me given what I experienced with another brand that shall remain nameless here.
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Postby 50koruny » Sun May 30, 2021 10:34 am

Motors, servos, magnets, track pins and few other things.
Basically anything needed for the building, excepting control unit, smoke, sound, transmitter and receiver.

Track tensioners will be fully reinforced with screws.They will work like real Cromwell tensioners.
They are designed to be as durable as possible.

Have some news.Engine covers and the exhaust.
Going to assemble turret and tracks.
Have more finished parts, but i dont have time to make photos of all that things everyday.

You can see the complete photoalbum in this link:
https://photos.app.goo.gl/yXxhhGVqHD1adK848

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Postby Xiaoshan_Sailor » Sun May 30, 2021 11:18 pm

Looking fine, Tomas! :clap:
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Postby midlife306 » Mon May 31, 2021 10:42 am

Most excellent work, I see you’re putting the resin printer to good use on the detail parts.
Put me down for the STL’s please
Cheers
Wayne


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Postby 43rdRecceReg » Mon May 31, 2021 10:48 am

The suspension housing truly follows the pattern of the original full-size Mk IV.
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Postby 50koruny » Mon May 31, 2021 12:10 pm

Yes.I am trying to follow the original as much as possible.

Apperance of the suspension springs is different, of course.
Same with the parts, used to mount that springs.
Swing arms are close to the original, but some shapes are changed for better durability and because of that springs.
Suspension springs will be 30-35mm long, diameter 8mm and 0,8-1mm wire diameter.It must be tested all together to find perfect springs.
Anyway, tension of that springs can be fine-tuned by moving that spring-holder part.
Armor plate uppon the suspensions can be removed anytime to get access to the suspension system.
Its fixed with screws, not with the glue.

Korba_m_spodok_116susp.JPG


This is a track tensioner from the outside.
Following original as much as possible.
There will be still some limitations and some compromises, but i am trying to do my best.

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