Supporting > Additive Machining

3d printing an engine block

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gadabout:
Hi,
I’m thinking to get an engine block 3d printed, say a Seal block, what alloy would be good to get it done in ? 6061 or the ALSiMg ?
Thanks
Mark

Jasonb:
I've only had Aluminium parts done in the ALSiMG but they all had quite thin sections compared to their length so the stronger alloy seemed the way to go. For something quite chunky like an engine block would probably opt for the 6061.

Treat the print a bit like a casting with machining allowances on the flat surfaces and crank/cam shaft bores. I would not print any of the tapped holes.

gadabout:
Jason, thanks
The ALSiMg works  out at 84$ the 6061 at 135$, wondered if it was worth the extra cost
Mark

Jasonb:
Probably not, machining of the 6061 may be a bit easier but I've not had problems with the other.

gadabout:
Jason,
Would you print it with the drilled holes in place ( undersize) but not threaded ?
Thanks
Mark

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