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The last time I designed a Helium Car I could not print it  with my  FormLabs 3+ printer without chopping it up into connectable pieces.

No matter how well you hide the connected pieces the multiple joints didn't look right to me.  The helium tubes should look smooth not jagged.

So my progress on the car ended  ....until now.

Even though I prefer the MIT (FormLabs) 3D Laser printers to the Chinese 3D UV printers, the ELEGOO got me on price for a large scale printer the ELEGOO Jupiter. The Jupe has a printing height of 300mm (11.8") 4.5 " taller than the FormLabs 3+ and about  $8,000 less than the FormLabs 3L printer.

So using Chitubox Slicer 1.3, which is remarkable better that the older version I once used, I inserted the Helium car design into the slicer.

Chitubox helium car

The prints will be in 2 complete pieces where the tubes part slides into the Helium car's frame part, no chopped pieces.  The car base that supports the trucks and the 3D printed undercarriage braking linkages is made of 1/4" acrylic.  Laser cut of course.

Still setting up the printer, so when it prints (and it looks like I can print 3 at a time.). TIME : slightly less than 24 hours, I  will add a picture of it.


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  • Chitubox helium car
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I can't wait to see the finished print.  I don't think you;ll need much in the way of supports except along the horizontal members.  Any thoughts about splitting the tank section into tanks and ends?  That way you can hollow the tanks and reduce their weight and resin usage. You would have to have drain holes.

The tank holds 1.5? liters plus an additional litter bottle in the auto-filler.

Good work!


Last edited by Jan

My nephew in Colorado has our Jupiter.  He likes it, but because it requires a lot of resin it is reserved for only models that require the big build volume.  We both have a Saturn and Mars.  We have been making small items while developing CAD models of European style railcars.  In other posts I posted this picture of a PRR F22 flatcar printed in one piece on a Saturn.




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I'm not planning on stepping on it, but normal operations it is plenty strong enough.  It has fallen 7 ft without damage, but I think it hit on a truck.  Brittleness was the original complaint about resins.  There are resins out there that are strong and/or more flexible and/or less brittle.  It's just like metal alloys.  People have been experimenting.  One combination is 75% standard resin plus 25% Siraya Tech Tenacious.  Siraya has a whole line of specialty resins just like Formlabs.

My trucks were printed on an early model FDM printer and show layer lines.  I intend to reprint them using standard resin and see howl well they hold up to use/abuse.  I need to spend some time research resin characteristics.  I expect there has been some work done and reported on YouTube.


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