François

Printed the main body and cab, I'm just about ready to paint. Here are a few shots of what it will look like. Naturally, every part will be painted separately.

I made another test print to see if the valves could be actuated via the camshaft. It appears that they can but I only put in 4 valves. I'm a long way from having 32 working valves. The test did show me where I need to make design modifications. All in all, I'm happy with the result and it was really fun to do but still not sure if it will go into the final engine. 20241016_202242.mp4 20241016_202303.mp4

Ok, so the valve train is all done and it's a thing of beauty! And it works! Well at least in Inventor it works... This is one complicated system. It's one thing to reproduce it with todays design tools but imagine doing this back in the 30's. These guys were good. I did print a few test parts and I do have one working valve/rocker. Up next is the camshaft drive which I will base the design on the Bentley's. Here are some pictures, screen shots and videos of the finish valve system. test valve and rocker arm Test piston and crank the full valve train in motion 20241015_201447.mp4 And test valve and rocker arm in motion 20241015_201844.mp4

Many things. The environnent is very important, -controled temperature ( 20 to 25 °c), I use a small space header during winter -good ventilation ( especially if using alcool washable resin) I only use water washable resin, a lot less smelly and results are good. -get a cleaning/ curing station, it's worth the extra $ -be very patient at first, it can take many tries to get your setting right -get a good slicer (I use the free Lychee version), doesn't have to be the slicer that comes with the printer. -all is in the support size and location. There will always be a "sacrificial" face on the part, the one that gets printed first because it usually the portion with the most support. I'm still learning after 1 year of pretty intensif use so be patient. -buy according to your present and futur neads. I should have bought a bigger printer but a year ago, I didn't know I would be printing such large parts as the ones on my Hydra Coupe projet. Hope this helps!

Jurgen, I also have an Ender 3 but seldom use it since I got the resin printer. At 12k resolution, the results are enormously better than anything a wire printer can give you. Printer prices have gone down alot, it would be worth every penny.

Thank you everyone. Minimal clean up to do. And depending on how I oriented the part in the slicer, a bit of sanding on curved surfaces. I use the Anycubic photon m5s. If you like this one, check out my other current build, all custom 3d modeled and printed. https://www.modelcarsmag.com/forums/topic/193597-marvels-hydra-coupe-112-scale-full-scratch-build/

Thank you BK9300 It should make a nice model with a few moving parts.

Hello everyone I was asked to 3d model and print a pair of Tigercat logger with a custom arm at 1/48 scale. I wasn't given the green light yet but I decided to go ahead and start the project anyway. Worst case scenario, I'll have a couple of nice loggers to add to my collection. I'm not used to work at such small scale but this logger is a big machine so it will still be a good size model. Here are a few shots of the 3d model And a few of some of the printed parts

Thank you everyone. Big John, the design is strongly based on the Auto Union V16 engine. But, like stated before, aside from a few pictures there's very little info on the engine. So I did get very creative. I have most of the rockers done, still need to do the cam shaft. I'll post some pictures tomorrow. I'm test printing a partial bloc and head with a couple of pistons and valves to see if everything fits. Working pistons is a given, I'm getting pretty good at making these work at 1/12 scale but a working valve train is another ball game. Even though the car and it's engine are massive, they are still at 1/12 scale so the valves, rockers and cam shaft are relatively small. If I pull this of, it might be a first at this scale !!

Made some progress on the valve train today. It's a fairly complicated system. The cam shaft is located on top in the center, between the 2 heads. Each head has a set of 8 rockers actuating the outside valves (exhaust). These rockers are actuated via 8 horizontal rods( or close to horizontal) going towards the cam shaft, not too sure exactly how these rods are moved but I suspect that they are directly in contact with the cam shaft. And positionned just beneat the cam shaft there will be another 16 rockers, 8 to activate the the left side intake valves and 8 for the right side valves. My goal is to try and have working valves but really not sure I'll be able to. I will print every part so at worst it will be static. Here is a cross cut of my ref engine where you can see the valves, rockers and horizontal rods. And here's where I'm at. The red line would be the cam shaft.

Grabcad do have nice 3d models but unfortunately they don't seem to have a V16 that fit my needs and they are stactic. I wan't mine to have rotating parts.

Did a bit more work on the V16 engine. That is a lot of pistons! It will be fun to watch if ever I'm able to pull this off and have a running engine. Like I said before, there's very little info on the Auto Union V16 so to get a somewhat realistic firing sequence, I found a little youtube that explains the sequence for the new Bugatti V16. 20241004_220959.mp4 20241004_221107.mp4 20241004_221107.mp4

The 3d model is slowly progressing. I started the v16 engine bloc. I'm basing the design on the Auto Union type C engine but like pretty much everything else on this project, documentation very limited. All I have are a few pictures of a totaly assembled engine so the dimensions and inner parts will all have to come from my imagination ( no problem there, that's even more). I inserted a few bentley pistons and conrod just to have a better feel. Should be ok. Block in car Block with bentley parts in just for fun 20241002_220801.mp4 I also finished the radiator assembly which includes the radiator cowling, rad core and blower. Speaking of the blower, there's a schene in the movie where you can see the blower being activated. And when activated, the blower's front dome starts to spin. I would like to reproduce this and have it spin while the engine runs. Now the easy way to do this is to simply have the dome in line and coupled with the crank. But that whould be boring. What I did instead is to slightly offset the dome from the crank and added a few gears to speed up the dome's rotation in relation to the crank. I was able to get a 2.5:1 speep up ratio. Here's the dome on the prop car And here is mine With a few gears added And the completed radiator

Big John, At 17.5 inche diameter (scaled up), the steering wheel is not all that small. But I'll admit that for a car that size it should probablly be bigger, I'm limited by the doors. At least it's bigger than the Bentley's which I find enormous for the size of the car. I might follow your advice and add some hydro fiiting and line somewhere.

Made some good progress on the front suspension and steering mecanism. The front leafsprings are done, just need to add some dampeners. Not sure what type yet. As for the steering, it's been close to 40 years since I designed a steering mecanism. They are many rules to follow to get a proper steering geometrie but, this being a model, I'm keeping it simple. I did try to get the ackermann close ( that's when the inside wheel pivots more than the outside wheel since the 2 radii are different). I also designed the steering column, I went with a worm gear setup a bit like the one on the Bentley. it's quite difficult to get the different pivot points in the righ places but l'm getting close to something that works. Hopefully, the steering box won't be too much in the way of the yet to be determined engine block. 20240925_193953.mp4

I reworked the fenders and I think they are better. So with this done, the body is pretty close to being finished. It is now composed of six parts so it can be printed. I also made a few cross members for the frame. Here is the completed boby with revised fenders. The 6 body parts The frame with new cross members And the car as of today Next up, the front suspension and steering.

Finaly got around to model the fenders. Of all the parts modeled so far on this car, these were the hardest to do. I'm not 100% satisfied and I might play around with them a bit but I think it a case of 'leave well enough alone'. I also started the under fender storage boxes. They will have two hinges so they can be opened. Not sure what will be stored in them yet. I made the gas pedal which will eventually be linked to the carburators via a cable. Compared to the movie prop The windscreen frame And the gas pedal

Did some more cad work on the firewall assembly. I've included a period master brake cylinder (comes from a 1940 ford) and clutch cylinder. They both have working spring loaded pedals. I've also figured out a way to mount the dashboard on the firewall so that the body can be removed without removing the dash and steering column, a bit like I did on the bentley. Ans lastly, I added a properly scaled human so I could position the pedals correctly.

I worked a bit on the tank and it's not half bad, but the walls are too thin which caused some printing errors so I'll reprint it. I also printed both filler tubes with the gas caps. So I have a fully assembled gas tank to play with. I also test printed a tire and it came out pretty close to perfect. I would really like to print them with a soft resin but this type of material is quite expensive. I took a picture of the tank next to the Bentley's gas tank, it give a good idea of the enormous size this model will be. Like I said before, they are both 1/12 scale. The spare tire mount Tank with spare tire The hydra wheel next to the Bentley's The hydra tank next to the Bentley's

Thanks gtx6970 I made the cube holder/ flux capacitor/ quantum hyper drive thingy. It came out pretty good. I installed a blue led inside to light up the cube which will eventualy be reprinted out of clear resin. I'll also install some micro leds, one per side to illuminate the 2 blue rings. They too will be reprinted in clear resin. Here are the parts before assembly And assembled And lighted up And again, the reference I also test printed a wheel and the gas tank. The wheel came out great but the tank not so good. I could fix it and once installed with the spare tire on top it would probably be ok.

Oh, ok!! Flux capacitor, right... I was thinking it could maybe replace the battery, but flux capacitor works. I'll still but in the v16... but just for show.

You might have noticed by now that I'm a science fiction movie geek. Especially when it comes to most Marvel films, they have some really cool stuff in them. In the very first one, they introduced a thing called a 'Tesseract', it's a blue glowy cube which is supposed to be a limitless power source. At one point, the cube is inserted in a cool looking devise. So I decided to add this devise in the car. It has no pratical use whatsoever, it's just looks cool! Here's the movie prop And here is my version I'll run some wires (red lines) from the gadget to the engine bay. I might even put a blue led inside to illuminate the cube. I also did the dashboard and steering wheel (a lot simpler than the Bentley's) And the door panels

I added a few more details to the body. Left and right hood now open, did the interior shape(it will all be upholstered in red leather), added the dashboard top with 4 gage bodies and did the Captain America's shield on the inside of the trunk lid. Still a lot more body to do.

Many more body details added today, tail lights ( I still have to figure out the wire routing and battery location), hook anchors, antenna holder and rear cockpit surround. I also did the interior of the trunk space which is 100% hypothetical since I have no pictures of it. The prop car probably didn't even have an opening lid. I imagine that the round bump on the trunk lid is to clear the massive spare tire but again, 100% blind on this also. About that bump on the lid, it stangely ressembles Captain America's shield. Maybe I'll paint the interior of the bump the same colors as the shield, make it a cameo of some sort.

I modeled the trunk lid hinges today, it wasn't easy to find the right pivot spot but I think I got it. Same goes for the suicide doors, those pivot points were even harder to find. So far, it looks all nice and feasable on the screen. But the fun will start when I actually start building the freakin thing!!