king derelict

Now you have me wanting to dust off the Illustrious kit and dive back into some PE Alan

I hope the digressions into the 3D printing problems are acceptable in a build log rather than just a focus on teh model itself. I wanted to try to capture what I am learning with the process of making the 3D prints and maybe showing the lessons and results as well as the creation of a model This morning I found that the controls on the printer allow a set length of filament to be extruded through the nozzle. So if you set 100 mm and you only get 95 mm its under extruding. That was the sort of information I was looking for so I marked 100 mm on the filament and set it running. It only extruded 50mm! A repeat attempt gave the same result. That is much too far in error to be a factory calibration problem so I wondered if it was the filament possibly being too hard and slipping in the extruder so I got out another reel and this time I got 60 mm instead of a 100 mm. Out of curiosity I tried a brand new reel and got 70mm. The value for each reel seemed repeatable, I can't see anything wrong with the extruder but something is not right. I increased the e-steps (the ratio of stepper motor steps per mm extruded) and a print came out much better. I don't think this is a dependable fix so I have ordered an aluminium extruder upgrade set to replace the factory plastic one. I can only think the extruder gears are slipping and the relative hardness of the filament results in the different extrusion rates. With luck I can get the upgrade installed in the next few days and see how it works out. I might install a new nozzle at the same time. Hopefully the voodoo will return Alan

Sad but probably a good decision; some stuff just doesn't work out and moving on to a fresh adventure is better. Building a stunning Hood will more than compensate. Alan

Great to see this started Alan

Thanks Mark I have been reading that there are a batch of bad motherboards out there that cause extrusion issues, binitial layer instability - makes me wonder. 😄

I painted the raised edges of the tracks with gun metal to show bare metal and dry brushed more randomly onto the track plates. I think the bare metal, remnants of paint and rust is a starting point for adding mud and dirt. A thin coat of acrylic clear coat was then applied ready for oil based washes I dabbled with the mud patch to see if I could improve the mud quality. A welcome break from printer voodoo Thanks for checking in Alan

It think that is the frustration, I'm used to working through a clear diagnostic path to neck down to teh problem. This seems like you could end up with another machines worth of spare bits and still have no idea what is causing the problem. I forgot vibration, fluctuating ambient temperature, phase of the moon etc 😄 Alan

Thanks for the kind comment Denis. Its a relaxing and fun build and seems to be painting up nicely.. I'm tempted to try another in a trench diorama. The lack of colour photos means that evidence of the real colours on WW! tanks is very sketchy. I'm experimenting with the mud! Alan

Most of the day was spent down the rabbit hole of 3D printing but I did manage to get a coat of olive drab on teh Whippet. i tried for thin coats to try to let the black primer shade some of the panel lines and angles. It seems moderately successful Thanks for looking Alan

Darn it - that was looking so good only a couple of posts ago. I notice that I seem to have steered clear of anything that has a clear screen or canopy. I'm sorry to see it finish like this it. It was a great build Alan

Today was mostly spent with the mechanics of printing. I talked to my colleague in Maryland who has an Ender 3 and asked if he could try a print of the life raft support using the gcode file I sent to him to see if its a problem with the file or set up. He was in the middle of a TPU print so forwarded the request to a mutual friend who also has the same machine and he was able to get a good print at the first attempt. That suggests that there is nothing wrong with the files driving the machine and leaves the machine, the operator and the filament as the problem. On line research suggests that it could be one of the following - bad nozzle - under extruding - over extruding - bad motherboard - slack belts - over tight belts - bad stepper motors Its quite a (contrary) list and opens up the possibility of spending a lot of money chasing this around the machine. A new nozzle is not a big issue and an upgraded extruder is not too expensive. The belts look OK. Installing a new motherboard sounds difficult and pricey. The problem is diagnostics seem to be difficult to find; it seems to be a question of keep changing things until the problem goes away. At some point its cheaper to just get a new machine. I need to resolve this to print most of the remaining parts. As you can see in previous images there are areas of bad printing in some of the deck pieces but that can be fixed with primer and filler. The adventure continues Alan

I ordered a reel of the OEM filament to see if that makes any difference.

That looks great OC Alan

Today I finished shimming the deck sections to achieve a flush and consistent level along the hull. The basic building blocks of the structures are complete and placed on the hull to determine final positioning. I have determined that I want to move the bridge, funnel and deck house back over the engine room and then reshape the aft section of the bridge deck to mimic the modified Flowers (ay least some of them). The funnel still isn't really far enough back but any further results in a short engine room and very wrong aft bridge deck so I think this is the best compromise. The photos show the deck sections in the modified position and the gap that will need to be filled with plastic sheet Thanks for looking and for all the support Alan

Hi Mark Yes, I think you are right. I have read that different brands of filament need slightly different nozzle temperatures to achieve a good performance. I spent the afternoon trying to print this - the life raft support structure I varied speed and temperature but never got close to a good print. I guess I can fabricate a structure from plastic rod but that sort of dodges the point of the model. Alan

Its a good point; I wondered if it was considered to be useful to reduce the chance of being seen by aerial reconnaissance when they were parked up behind the lines. But then netting would be better. I'm still learning a lot and it seems that there are some varied opinions out there on the British colour schemes. The Germans did use quite complex paint schemes by comparison. I think I have read that teh British abandoned repainting in green / khaki and just left them in as-delivered grey at the end. Alan

I started work on the tracks brushing some basic rust onto the tracks but leaving some paint. This is the first time I have used the Mig Track Rust and I quite like it. Some bare metal next and then maybe some mud. I played around with an idea for some mud that goes beyond paint. I mixed some brown craft paint with some ground ceramic bricks (Aedes Ars castle kit) and a dollop of glossy medium. It looks quite promising when I spread it around on a piece of cardboard to evaluate it as a base. I'll add some puddles using epoxy to enhance it a bit. Then the ditching beam, I should have some suitable spare wood lying around Thanks for looking Alan

The Whippet got its black primer coat and it looks like the small amount of filler on a couple of the seams was enough The machine guns might be a bit overscale but I think they will be better than home built ones I learnt today that the horizontal bars extending out of the front and rear hull are to allow canvas mudguards to be installed. Thanks for looking Alan

Hi Mark For a basic kit they do come together nicely. I think they are quite decent when painted. I think there is a Czech PE kit for teh Mark IV but I haven't been able to find it. Alan

Thanks OC. Its a tough choice the Fleet Air Arm or the Tank museum. Might have to try for both. Alan

Thank you for the great photo OC. The Bovington Whippet is one of the decal options in the kit. There are eight options. Five British, one German, one Soviet and one Japanese. The Bovington Whippet is the one Lieutenant Sewell was commanding when he won his VC. I read this snippet regarding the Whippets in action at Amiens. During this battle, one Whippet – Musical Box – advanced so far it was cut off behind German lines. For nine hours it roamed at will, destroying an artillery battery, an observation balloon, the camp of an infantry battalion and a transport column of the German 225th Division, inflicting many casualties. At one point, cans of petrol being carried on Musical Box's roof were ruptured by small-arms fire and fuel leaked into the cabin; the crew had to don gas masks to survive the fumes. Eventually, a German shell disabled it and as the crew abandoned the tank, one of them was shot and killed and the other two were taken prisoner.

Hi Mark Same material but different manufacturers so maybe there is something there. That's the problem, trying to decide which variable is the one giving trouble. I spent the afternoon trying to print the life raft supports and could not get a decent print. I swapped filament to no avail. Wondered about nozzle temperature and cranked that up, maybe its the print speed so slowed that down. That made things a little better but still didn't get a good print. Then you start to think; should I change the nozzle, is there a fundamental fault in the machine. Identifying the cause of the fault is not easy - at least to me. At least with Yves making the same model I can dismiss the print files as a source of error. I think teh ideal would be to have a friend next door with the same machine and filament to cross check performance and settings.😄 Alan

Thank you OC. I think I am going to finish building up the basic structures. I think they are all printed now and then take a break and work on a Flyhawk 1/700 or similar to get back to a more structured build. Right now I'm trying to print detail parts like the life raft supports and its proving almost impossible to get a good print so putting it away for a while might be helpful. Alan

I can't leave those Emhar boxes alone. While the parts were printing and the epoxy was drying for the corvette and the paint was drying on the Mark IV I took a peek in the Emhar Whippet box, I'm not sure if this is a later Emhar offering but the detail seems a bit better and the parts come sealed in a plastic bag with the instructions and decals. The instructions are simple but there are only about twenty parts For the Whippet a better attempt has been made on the Hodgekiss machine guns compared to the thick rods that represented the Lewis guns on the Mark IV. The tracks and running gear is a single moulding with a back side that closes it up. The fit is good; all the parts went together nicely once the sprue locations were cleaned up. So that's all the parts from the sprues used up And shortly afterwards its all together And off to be painted with black primer in the morning. Thanks for looking Alan

I wasn't very happy with teh overall appearance of teh olive drab; it seemed to be pretty bland so I mixed some buff into dilute olive drab and misted it onto the model It still wasn't what I wanted but there is a bit more depth so I repeated the process with more Buff in teh mix The photos all look very similar but in real life I think ether is more shadowing on the model. I'll work on the tracks next with a mix of mud, rust and bare metal. Alan