Landships II

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Post Info TOPIC: Using CAD and 3D printing to correct the Airfix Mk1 tank


General

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Using CAD and 3D printing to correct the Airfix Mk1 tank
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I am presently working on creating a replacement driver/commanders cupola (width corrected, rivet detail etc, etc) and a ‘roof’ with the circular access and riveted joints corrected etc (with thanks to Mk1 Nut and all the work she has done).  My prototype print indicated a need to increase the size of the rivets (mine were a bit too close to ‘scale’) so they were increased by 50%.  I shall run a test print on Monday to see if I am close to ‘Airfix size’.

The details can be seen here:

 

or not!  Hmm, I seem to have forgotten how to add a reasonable sized picture! 

OK, hows this:


FDPxrOSm.jpg

 



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PDA


Legend

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Looks good so far. Will it just drop in to place on the Airfix?



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That is the plan PDA, certainly the prototype did and I am not changing any of its dimensions, just adding detail.  Anything designed will be a direct replacement for the original kit part.
I have it in mind to produce more accurate side sponsons, certainly for the ‘male’ tank. Elsewhere, I have shown how to make the ‘steering tail’ more accurate but I might have a go at designing one for printing.



-- Edited by TeeELL on Saturday 16th of September 2023 02:58:59 PM

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PDA


Legend

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Excellent and laudable ideas!

I don't want to bring the mood down, but do you have any ideas for fixing the track tensioner? Replace the whole side frames?



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Iirc, I carved out the shape and added a thinly sliced and trimmed section of tube. I think replacing the whole side frames is a step too far. Certainly not something I would entertain. As an aside, when gluing the side frames together, make sure you remove the positioning ‘pips’ otherwise there will be an alignment problem.

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General

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I have to create a balance when making the enhancements, generally based on personal experience. I’ve agonised over how to widen the cab and add the detail on previous builds, I’ve carefully removed the non-existent joint on the main roof section and placed it where it should be, removed and filled the cheese wedge and fitted the circular hatch - these are things that a printed replacement can sort readily. It still grieves me to see modellers building Mk 1 tanks with all the errors of the Airfix MkII. Things like the track tensioners are doable using traditional skills. I suppose designing and printing a replacement is perfectly feasible - but cutting out the original …….?



-- Edited by TeeELL on Saturday 16th of September 2023 11:21:10 PM

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General

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Today I have fitted the prototype cab to an Airfix model. The fit is great although there is a curve to the rear face - need to revise the supports/print orientation.

 

omW2AiG.jpg

 

The original Airfix cab shows how much extra has been added.  I need to check the track clearance before I go much further.



-- Edited by TeeELL on Monday 18th of September 2023 01:59:19 PM



-- Edited by TeeELL on Monday 18th of September 2023 01:59:41 PM

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PDA


Legend

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That's coming along nicely.

I am not nimble-fingered enough to change the track tensioners the way I've seen other people do it. Instead I used some Oyumaru and Green Stuff to copy the Master Box ones, and did a 'horn transplant'.



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PDA wrote:

That's coming along nicely.

I am not nimble-fingered enough to change the track tensioners the way I've seen other people do it. Instead I used some Oyumaru and Green Stuff to copy the Master Box ones, and did a 'horn transplant'.


 I might have a look at that option and create some ‘cut and paste’ replacements.

 

In the meantime, I have finished detailing the roof

 

:4kFMO90.jpg



-- Edited by TeeELL on Tuesday 19th of September 2023 01:56:07 PM

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The updated parts are printing. The cab has been narrowed by a tiny amount and both that and the roof are in the process of being printed.


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An update. Firstly the cab that appears in my earlier post - the file became corrupted somehow! I have had to start again, not such a bad thing as I had made the width too great. I printed the basic version of the new cab and it is fine so I will be adding the additional details. Hope to have it done for SMW, Telford.
The roof has worked well, I am going to revisit the raised plates around the exhausts as I might have made them a little bit too large. The resin took on a slight curve across the roof panel, so I have added ribs underneath to correct that.
I have made 3D printed tracks based on a revised version of Arie’s .stl (single link) file - revised to fit the 1:76 and 1:72 model’s track runs not for any other reason. I fitted a Masterbox Mk1 with a 3D printed track run to show at the R.E.M.E Museum model show last weekend.

YwuIGFe.jpg

the slight lip at the bottom front of the printed cab has the riveted strip which also serves to disguise the gap that features on the Airfix kit.



-- Edited by TeeELL on Monday 9th of October 2023 09:32:00 AM

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Legend

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I do hope you are carefully storing and curating your .stls because, if you aren't going down a commercial route,  there may be some pressure to donate

your corrections to Landships II.

Charlie

 



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It has been a while, I’ve been busy with my own modelling and other CAD and 3D printing projects. However, I’ve had a week away and in some spare time have been working on parts for the Mk1 tank. The original cab files became corrupted somehow forcing me to start again. As previously mentioned, I am indebted to Helen (Mk1nut) for her drawings - referred to extensively in my design, together with a MasterBox Mk1 and, of course an Airfix kit.
I have now all but finished the new design, just requiring the front towing bracket to be completed:

qpFzTiOm.jpg

6oApWJam.jpg

I do think I need to do some extra work on the ‘hinges’ of the circulare crew hatch on the roof section.  I’ve seen a photo of one somewhere, just need to find it.



-- Edited by TeeELL on Friday 19th of April 2024 06:05:49 PM

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I mentioned the 3D tracks in an earlier post. Here is an image of samples fitted to my MasterBox Mk1

 

ZJPeLJ6m.jpg



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Ned


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Excellent 3d work 



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Thanks Ned.
Since my previous post I’ve had feedback from Helen (Mk1Nut) and need to undertake a few minor corrections to the roof and the cab. I also have a much better idea on the shape of the ‘pistol port’ covers so I am going to reshape those accordingly.

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