The porosity, which you call blemishes, are due to air bubbles being pulled in the cavity during the pouring, which makes your metal very porous. You need to decrease the diameter of the riser, and build the poring basin in a way that the riser hole will always have metal full to the top when pouring. Also add the gates to the parts from the bottom of the mold. Filling the mold from bottom allow for much less defects and decrease bifilm formation.
Thank you for taking out the people time to comment! I may be wrong but it's actually a cuboid, not a rectangle. I guess kindergarten math is a waste of people time too
you are wasting people time! your Forefather ( the rect angle ) was Ashamed, To Have descendent of your sinister nature ! “delete comment.. delete comment” the echoes whisper 😮 “DELETE!” the chant goes on, Your Ears Filled with Their Songs of anguish until you can No longer Think… ooh ooooooh woooo … delete comment
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The porosity, which you call blemishes, are due to air bubbles being pulled in the cavity during the pouring, which makes your metal very porous. You need to decrease the diameter of the riser, and build the poring basin in a way that the riser hole will always have metal full to the top when pouring. Also add the gates to the parts from the bottom of the mold. Filling the mold from bottom allow for much less defects and decrease bifilm formation.
That's amazing! Thank you for that insight, is there any place you could please direct me where I could learn more?
Super cool. Does this work for more complex shapes too?
Thank you! Yes it absolutely does work for more complex shapes. It'll work for anything that you can remove from the sand without damaging the mould.
I recommend using poly cast filament instead
Thanks! I'll give it a go next time :)
It would be nice to compare the final dimensions of the cast and 3D printed parts.
That's a good idea, I'll do that next time. There's normally a 2-3% shirinkage when casting aluminium.
You don’t need to remove the printed part from the mold, and some filaments are designed specifically to burn away cleanly in this use case
Yeah that's true actually -- thanks for the tip. I'll try lost casting at some point.
@@MakerVibe keep in mind you want low walls and low infill so it burns away easier though
This is sand casting not investment casting tho. You don’t melt out the the wax/filament in a sand casting.
wow a rectangular shape, what a challenge
stop wasting people time dude
Thank you for taking out the people time to comment! I may be wrong but it's actually a cuboid, not a rectangle. I guess kindergarten math is a waste of people time too
3 subscribers … do they know? of Your Hatred ? For rect and angles ? 😢 fraud
talentless scum! begone!
you are wasting people time! your Forefather ( the rect angle ) was Ashamed, To Have descendent of your sinister nature ! “delete comment.. delete comment” the echoes whisper 😮 “DELETE!” the chant goes on, Your Ears Filled with Their Songs of anguish until you can No longer Think… ooh ooooooh woooo … delete comment