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Another monster tank....the IS-4

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Another monster tank....the IS-4

Old 02-04-2023, 03:08 PM
  #1  
tankme
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Default Another monster tank....the IS-4

Since I already showed it in the IS-7 thread I thought it might get some space of it's own.

And after 9.5 hours of print time and 195G (mostly supports) of filament later...a turret emerges. Yes, I tried tree supports and got two 6 hour in failed prints as the tree supports would come off the bed mid print.




Here it is almost all cleaned up from the supports which was a PITA BTW. PETG supports are notoriously hard to get off. The support surfaces are really rough, but they won't show in the finished tank.




And of course a side by side of the two brothers from two different mothers:



Printer is already hard at work on more parts.

Derek
Old 02-04-2023, 03:38 PM
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Tankhobby
 
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Have you thought about slicing the turret horizontally into maybe three or four pieces to avoid the supports? Print the top part with only a small portion of the sides. Then print the side sections, since they are angled they may be able to print without supports. When all are done glue together. I have a Sherman turret I need to print for a 1/6 scale tank. Printing the turret whole is like three days. I thought of this to make it more manageable.
Old 02-04-2023, 04:19 PM
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tankme
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Nick,

Inkor had already sliced it in two, but the way it was sliced it would've still needed supports. I had to do a lot of work on the IS-7 turret that was in two halves so I wanted it as one piece.

Derek
Old 02-04-2023, 08:38 PM
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Nice.
Old 03-11-2023, 11:31 AM
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tankme
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Made quite a bit of progress on this guy recently. At least most of the major components are printed. After doing the initial assembly I really didn't like the fit of the deck to the sides so I reprinted the sides from the new Sunlu PETG-G I got. The Bambu had a few firmware updates that seemed to fix the initial issues I had printing them so I was able to print them as one piece now. The fit is so much better. This is how she stands at the momemt. That pile is 160+ track pieces. Not a lot of post processing done yet. I wanted to get the mechanicals and physical build out of the way before disassembling it to do the finishing work.

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Better shot of the track quality. Printed them 54 at a time and it took 6.5 hours per sheet at a 0.08 layer height. They were printed at an angle so that both sides had good surface quality. Only supports used were specified as "critical areas" and only touching the bed. They came out quite nice. I can't assemble them until my spring steel wire arrives on the slow boat from China.

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Close up of the muzzle brake:

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View of the suspension. I have some gearboxes arriving today so I can get the sprockets mounted soon.

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Another side view.

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Rear view.

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RichJohnson (03-11-2023)
Old 03-11-2023, 07:24 PM
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Durahl
 
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Maybe have a look at Resin 3D Printing some of the more intricate parts? 🤔

Generally I'd be doing literally everything that isn't the size of the Hull and Turret on my SLA 3D Printer but especially the Tracks and stuff like the Muzzle Break came to mind.
Just get yourself one of those Vortex IPA Cleaning Stations to let it deal with the mess of getting the remaining uncured Gunk off a freshly 3D Printed Part and it'll be hardly an issue dealing with mSLA vs. FDM.

Any shots of how your FDM Tracks were oriented while still on the Build Plate? Kinda curious how you oriented the Layers in order to deal with the Pins not getting stripped out of the Links or the Track splitting apart in the middle or at the Ends😁
Old 03-11-2023, 08:05 PM
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tankme
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I actually have a resin printer sitting in the closet right now with a wash/cure station...both new in the box. I haven't had the time to set it up and play with it yet. I haven't printed some of the really small details as of yet because of that.


Orientation

Sliced

Derek
Old 03-12-2023, 02:19 PM
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Very nice, I can't wait to see them finished! I love the aesthetics of the IS series. I have a Juckenburg IS-3 kit I'm going to get restarted later this year after I get a couple other projects finished. How is the overall build quality on Inkor's IS-4, I have his C1 Ariete that I'm hoping to start printing soon.
Old 03-12-2023, 03:18 PM
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I purchased the Ariete also, but haven't started printing it yet. Overall things fit together really well. There is an area around the driver's hatch where the hump isn't connected to the armor plate, but that is pretty easily fixed with some glue and left over support plastic. The issues I have with a both the Hellcat and the IS-4 is gearbox maintenance. The gearboxes are going to be really hard to remove for maintenance after the builds are complete. For the Hellcat, they are mounted under the front glacis plate. Problem with that is that the light guards for the tank extend from that plate to the lower plate. That means you can't glue the lower parts of the guards to the lower plate or you won't be able to remove the gearboxes at all. With the IS-4, the motors are under the rear plate. You can remove the gearboxes but you would have to remove about a dozen screws to do it. I was planning on trying to glue a lot of the panels together, but for maintenance I will probably have to leave a lot of them just screwed together. There are some areas where hatches aren't supported from underneath. Not hard to fix - just need to glue some flat stock under the edges of the hatch to keep it from closing too far.

I also thought that the Taigne mid/low gearboxes were a decent price point and build quality that would work with these tanks. They fit in the tanks fine with some slight plastic grinding, but the mounting holes don't line up right. Since Inkor made the screw hole area only slightly bigger than the hole itself I will probably have to elongate the mounting holes on the Taigen gearboxes to make them work. It's like the mounting holes are 2mm too close to the outside hull wall. Being short shaft gearboxes, they have to be butted right against the hull walls to have enough of the shaft to mount the sprockets. It's the same issue in both the Hellcat and the IS-4.

I wish the idlers, road wheels, and return rollers were spec'd to use bearings. I may try to add bearings to as many of the tanks as I can to reduce wear of plastic on metal shafts.

So basically the designs don't have maintenance considered.

Derek
Old 11-12-2023, 03:34 AM
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tankme
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Worked on the IS-4 a bit today. Still lots of printer lines to hide, but it's coming along nicely. Got motors, elevation, recoil, high intensity flash, turret handles, and tracks installed. Just getting everything mocked up. Been adding the red glazing putty with an old paintbrush so it's going on more consistent and easier to sand down.

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PE YOUNG (11-12-2023)
Old 11-15-2023, 12:44 PM
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Wow, nice build. Thanks for sharing!!!
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tankme (11-15-2023)
Old 01-06-2024, 05:54 AM
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Been busy working on multiple projects, but made progress on this guy. I have been getting much better with the Bambu slicer so I took advantage of that. I have always hated that Inkor's designs don't incorporate bearings in anything. The road wheels he designs also have saving filament in mind so the inner wheels usually have vast open spaces in them with small hubs. The hubs are usually too small for bearings in some cases. I decided to fix these "issues (for me)". First off, I filled in the backs of the wheel to give the bearing more support. Secondly, I modified the road wheel STL to accept a 3mm bore x 7mm x 2.5mm flanged (8mm flange) bearing. Then I reprinted the wheels out of ASA to get more detail with less post processing. Don't mind the secret project bogie truck in the picture... :shh:

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With numerous successful resin prints under my belt, I added a bunch of resin details to the tank. They are not permanently attached at the moment. The new wheels run smooth on their new bearings. I will be updating the idler also. Currently I'm reprinting some of the upper deck parts in ASA to enhance the detail. I can now print ASA freely as the printer now lives in the garage. Makes me wish I hadn't printed so many parts before moving the printer. PETG is great for strength, but less so for detail. And also now that the resin printer is working, I'm going to be printing tracks for some tanks in resin.

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That's all for now...

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