The issue in reverse is the tender!! If you look closely, the clearance in the tender wheels is allowing the tender to rock back on the wheels and quite literally apply the brakes!!! When you're going forward the wheels move back in the guides and the brake blocks are clear!! Either add some additional clearance to the blocks, or tighten the slots for the axels... That said... SUPERB model Sam... a work of art!!!!

The "Lady of the Lake",prototype in shop gray,ready for her first portrait photogragh,taken with an 10x 20 camera,and the usual orthochromatic film! That would be Mr. Webbs record for the Crewe Library,and the engineering section! Thank you,Sam,for your imagination and overcoming sundry obstacles! Thank you 😇 😊!

The boiler wheel cut out is way upper than it should be, lower it for the next model so that there's no gap between the boiler and the wheel decorative splasher. For the problems in reverse: The wheels of the tender get stuck, they have no space of free movement.

Really great stuff Sam. One thing to note that might be of use; where you get issues of warping on the resin printed parts (it was more noticeable on that first wagon you made), the printed parts can be gently heated in warm water (not hot) and possibly eased into the true shape. I've done this successfully on long thin parts , although larger items like the loco body might be tricky. Either way, best of luck with the final build!

This model has come out amazing! Well done Sam

Really great work on this! For the reversing problem, try adding a spring to the front wheels. I suspect that the main drivers are tipping the front down just slightly, causing the back wheels to lift off the track and lose traction. A properly tuned spring will keep the front held up so all 4 geared wheels stay on the track.

The amount of faffing around you needed to do with this lives up to it' s name with this engine, great job!

Well done, Sam! I am impressed. For a model of this quality it might be worth having the final version painted and lined professionally. Incidentally, perhaps you would consider donating a copy of your CAD drawings etc. to the LNWR Society who have a very active modelling section.

These locomotives were painted in a green livery (the LNWR had two express passenger liveries, red for southern division & green was northern division), of course they were painted in the standardised black livery in later years but the green is a very interesting livery given most people have only seen the Black on Cornwall & the preserved coal tank

You did a great job on building this model Sam, I can't wait to see it when it's all painted up. Cheers Jasper & Willow

It's crazy to think that one guy with a 3D printer and some spare parts can make a model just as good (if not better) as an entire factory full of teams of people working with intricate machines and tools and what not. Great job Sam!

Two words, spectacular and gorgeous. It looks like the photo op protype with the photograph Grey color. Hope this success with the resin means you'll try to do some larger tender locos especially ones that never got built but have blueprints like the GWR Hawksworth's pacific or even the LMS Fowler pacific or even another freelance design. Or even "one-offs" like the 4-6-4 Hudson-type Tank that the Midland railway did(I think the lbscr did a 4-6-4T too). Anyway, love the behind the scenes prototype video. Can't wait for the main reveal!!!

The channel title has never been so true! Beautiful work, I really enjoy the self-made gauging solutions.

WOW! That is brilliant! Can't wait until the final model is displayed. Keep up the good work!

The Problem class 2-2-2 has been my favourite British steam locomotive since I first laid eyes on it in a book as a 3-year-old... You're building my dream model here Sam, I didn't think I'd see it modelled in my lifetime in HO. If you ever think about making more than one of this beautiful locomotive, I'll be first in line to buy one from you. Don't care that I'm literally on the other side of the world in an ex-colony, this is my 'dream' model, and I'm loving watching you slowly bringing it to life

Excellent work Sam and the best model you have created. It needs an equally high quality layout and as someone else remarked, some genuine north western coaches.

Hello. I do remember a few months ago you said kit built locos were rubbish . I am really pleased you have seen the light and have been converted ! Regards Mark

Hi Sam, I might be able to comment on your rod length issue. In a professional engineering environment I think we would deal with this in one of the following ways. 1. Tolerances. Rather than defining the length as 12.2mm, we would define 12.2 (plus/minus 0.5mm) and ensure the part works in that range, modifying the design if needed. 2. Decent clippers. Providing you are UK with a slight champer on the end of the wire (looks like you're hiding the ends) a good quality, hard edged clippers (knipex or similar brand) would allow you to clip to an accurate point especially combined with a jig (which you could 3d print). 3. A chopsaw set up. In this case you would need them Dremel mounted in a fixed position and a stop at the correct distance. Push the wire to the stop, then drop/plus the Dremel across the wire producing a cut at the correct length. One other point, at camera level you can see daylight through the boiler via the wheel slits which looks odd. Could you add an underside to the boiler in the wheel area? Otherwise your steam will escape!

Suggestion! Give it a slightly thicker layer of primer so the layers from printing will vanish completely and the wet sliding decals will adhere better to the finished piece.

Blimey, this must have taken months but extremely worth your while. The finest project done by you yet Sam! We can imagine the learning curve in terms of research, precision, detailing and actual execution, e.g. perhaps it would be best to actually postpone adding the tiny fragile details during the build as long as you possibly can to avoid breaking or damage since the model seems extremely fragile. Will the 3D printed internal driving cogs hold over time in terms of wear of their teeth Sam? On the plus side, new parts is just a matter of re-printing of course. Fantastic project! Just wow 💓 Cheerio.

Can't wait for the finished version. I also hope you try something like this again somewhere down the line with another locomotive in the future.

Sam, this is a brilliant model already, and only moderate change I'd consider making is using POM (Polyoxymethylene) Acetal (aka: Delrin) instead of resin for the gears for the durability and low friction nature so the gears will mesh and release from each other with less risk of breaking apart due to torque application and theoretically last longer than in resin. Though, that might involve having to outsource the gear production to someone who works with POM-Acetal, or hunting down batches of gears in the right tooth counts which could be used for further prototypes (or even as part of a hardware kit for this loco for others to purchase and save them time).

Watching your iterative process is inspiring. Thanks for sharing your full process. You should get good results with some standard rail nippers for cutting the 1mm rod stock. Also, if you plan on continuing with the light gray resin, invest in a contrasting silicone mat to make those small bits stand out.

Resin printing really improves the resolution. The model looks great! I found the gearing to drive the rear wheels along with the main drivers particularly impressive. A bit of tender weight may help with the handling.

I'm surprised how little weight is in that, I'd add a bit more and see if it helps the slipping. Also might need a spring over the non driven wheel to help it push on the driven one.

Wow that coupling chain on the buffer beam is amazing. ! And you should be really proud of your work, and how for you have come, not only in your 3D printed work, but as a person. I always enjoy watching your videos, and nice that Chloe gets involved in your videos when you visit real railways. More 3D design if you can and a few more of your visits to heritage railways from time to time. I got my first Accurascale locomotive, a Class 37 in large logo livery partly due to watching your review video, and because they are my fave class of BR diesel locomotive.

Mate, that looks incredible; you should feel really proud of yourself. You might well be producing the best-running early period locos out there with that gearbox design you came up with - that was a really clever idea. I know selling ready-to-run models probably isn't worth the hassle for you, but I genuinely think you should consider selling this in kit form, even if that is on a print-to-order basis. Especially if you did some unpowered wheels

I love this era of rail and wish more were available. Well done Sam.

Smoother running and nicer looking than 90% of Hornby products

OMG, man that prototype model is so nice at it is going, can't wait to see it finished and fully painted ❤️❤️❤️

Incredible project Sam, considering that you started out on a cautious but promising start. You've taken it to the next level here. I look forward to the ultimate product. Regards, Samuel Farris.

Watching with awe! What a superb model! Looks so good when running.

Just... WOW..! Well done young Sir..! Impressive work..! Cheers All. 😎

Look's like a Unique Engine Sam. When it was hanging up in reverse I thought I seen the Culprit on the Coal Tender on the first set of Axles Wheels. Also, Did you used any gear lubricant in the gear box? Hopefully everything Irons out for you on the revision. Cheers ! 👍👍 No Stress Sam, We're all counting on you !😁

Looks fantastic. Can’t wait to see it painted.

I would 100% pay for this kit. This is my favorite era, and there are so few options for models beyond ancient metal kits or scratch building

Great work. Interesting to watch! Looking forward to the next video!

That is spectacular! Beautiful prototype, beautiful model. Well done!

Amazing work, I love it.

Great to finally see some more progress in this model Sam, some great work there, I myself have a few locomotive projects in mind but they will be using ready to run models. Keep up the great work on this model.

Wow... That is an excellent model already. Looking forward to seeing the final model...

Beautiful would be an understatement. This is inspiring too. Thank you, from across the pond.

Wonderful. How about a GWR broad gauge Firefly next? You could use your printer to produce the sleeps and use Peco rail.

Sam you've taken your channel to the next level, well done and keep the 3D printing rolling

looks fantastic, well done.

Its looking fantastic sam, delighted i could yelp you with this! :)

Wow. What a superb model. Well done for choosing a LNWR prototype, considering that it was the Premier Line, it’s woefully under-represented in model form. Perhaps your project will persuade a manufacturer to produce a run of RTR models? I will never go down the road of scratch-building such a model at this stage of my modelling life, but watching this is inspirational. Your channel has come so far and one wonders where it will develop to in time?!

Sam, what a beautiful piece of design and engineering. You have indeed come on a very long way in the past couple of years. Excellent work my friend. Keep it up.

You did a crackin' good job on this one, Sam. Cheers.

This is genuinely as exciting as seeing a fully fledged manufacturer's engineering sample, what a long way home-made models have come!

Wow so skilful, and your close up camera work is excellent.

In all probability you've already spotted this on the video, but with the possibility that you hadn't, on the subject of the loco struggling to reverse and wheel-slipping, I did notice a couple of times that when you were trying it in reverse, the front set of tender wheels seemed occasionally not to be turning freely, while the rear two were turning perfectly, so possibly some issue there might have been hampering movement in that direction? Around 28:14 is a good place to spot it. It's a beautiful design, and the finesse of the parts is absolutely amazing. I love the beautiful curved shape of those huge splashers, and the spoked cut-outs (which probably isn't the right term at all) look incredible. The combination of those splashers, the massive single wheels, and the chimney cap give her something of the look of a paddle steamer on rails, which very much fits the Lady of the Lake moniker, I think.

Most impressive. I think you need an investor and a business plan Sam. The potential for this sort of thing is huge and the vast array of early UK locomotives you might choose to produce is virtually endless. Good Luck!

Excellent! Very well done Sam

Blimmin brilliant Sam, you should be very proud

Super engineering. Well done.

Impressive! Well done!

Your lady of the lake is looking amazing, nice job Sam.

Very beautiful already in photo finish!

Fantastic well done, Hornby/Dapol look over your shoulder

Bravo, it looks good

Mister Sam, I must say you are one talented chap, you are; your passion project is coming along rather splendidly. ‘Lady of the Lake’ looks bloody marvellous! Brilliant, lovely stuff indeed! Cheerio, Giovanni Marino, M.D.🇬🇧

Wonderful achievement that. And she looks so good.

Fantastic video Sam, I'm curious to see how the printed gears will hold up over time. I usually order plastic gears in, module 0.5 works with most brands of OEM gears.. it's a painstaking process getting the correct center distances and mesh depth, but I'm sure you've encountered that already.. keep up the great work!

What, no sprung buffers!. Nice one Sam.👍

It's awesome Sam.... great work! 👌

Very nice job

It looks great

You should get a job with HORNBY and show them how it's done. In you they have a designer and builder with a proven track record...no pun intended. GO FOR IT SAM.

I will resist the temptation to ask about sprung buffers.......Doh! Well done for the first construction.

nothing sad about it sam! your attention to detail and miniature engineering is very impressive. ive been watching your reviews a good while now and your always balanced and informative. you provide a good service to the hoby. thank you and keep up the good work.

I have a few thoughts in regard to the design. First off, you should probably find a way to mount the cylinder block as part of the chassis, just to decrease risk of breaking the side rod assembly. Secondly, the gears should probably be FDM printed, due to the fragility of resin. Tird, make the brake rigging on the tender a separate FDM part like the handrails, so that you don't risk breaking it while mounting the tender wheels. All that said, This looks amazing. I believe that a pro manufacturer would have made this largely out of metal, but that said, yours really looks like a proper engineering sample from an announcement article. I can't wait to see the final product!

That’s come out really well.

What a beauty!!!!!!!!!!!!!!!!!!!!!!

Stunning Sam.

Never thought of 3D printed gears, great vid and ideas.

She looks gorgeous, drop dead perfect.👍

I’m in awe!!!!

Amazing work Sam.

Sam, I am very impressed! I really like the idea of being able to print your own spare parts! You are inspiring me to look into this and attempt creating some of the GWR locos I want that no one makes. Things like the 26xx Aberdare and 2602-2610 Kruger 2-6-0 classes.

Sam you are crazy, I love it ! Good job ☺️

I can't wait to build this, too!

Well done!

First try with this? Absolutely fantastic job! Seems having a 3D printer (both resin and "traditional" filament) really allows you to up your game in the modeling hobby.

Excellent prototype, Sam ❤ I was holding my breath when you started the assembly 😅

WELL DONE SAM. MORE PLEASE.

Outstanding Achievement 😃👍

Have you ever considered using silicone rubber and low temp metal to cast you chassis? I’ve thought about doing that and I’d be curious to see how it turned out.

Fantastic Sam, absolutely brilliant - BUT you must have a crew in this one, you MUST!

That would look great in Caledonian blue 👍

You could build anything tbh, your amazing

Well done Sam good stuff....👌

Excellent work Sam, so much more fun than some other channels that get 'samples for testing' - wonder if they ever return they after giving them a stellar review.....answers on a post card.

Wow, that is beautiful.

Beautiful model. A good tip for glueing resin prints is to use a bit of uncured resin and a uv torch to attatch parts together or fill gaps. Cheers

This is incredible, can't believe how fine this print looks. This put a shame to some professional models.... All of these tiny details are marvelous.... Theres is just one strange thing, the fact that it's possible to see through the top of the splashers all the way through the boiler, it really looks awkward. It's a part that catch the eye for sure because of how beautiful it is, and the unrealistic hole ruin the magic a bit. Can't you put something in the way, just a square block, or something? It's also lovely that your prototype is shown here in "photographic gray" livery. Well suited ;) Can't wait to drool looking at the painted final product :P

Outstanding work. Brilliant. I don't envy you the painting though ...

Sam i rezlly like your pioneering spirit here, who knows where this will lead to. Well i gotcbuy a 3d resin printer, it would look lovely next to my pc and no doube woupd impress people, but having a 3d printer ir even a laser cutter is onething, but d3signing something like you did is another. Keep it up.

Very fine detail Sam - Don't think I'll be able to do something like that!!! 🤔🚂🚂🚂

A+ great looking model.