Hey guys! I participated in the Jewellry Printing topic, but I have a few questions more specific to sterling silver. I’ve had some success, but today decided to cast seven pendants and a prototype of an earring, and every one of the casts was incomplete. It was a filigree design but not too delicate. Should have been fairly easy to cast.
I have some casting experience, but am by no means an expert. I am prototyping and will then send designs that make the cut out to a casting house.
I know that in the past I’ve had the flask at a casting temperature closer to the 1100°F temperature, and after troubleshooting today with a fellow jewelry artist, she asked if I had cast somewhere around 1100°F. That’s when I realized that the Formlabs recommended temperature is only 900°F. I’ve only used this schedule in the past. Maybe I was just lucky?
One other thing…I was not ready to cast today after the one hour hold, so I held the flask at 900°F for about three hours (yeah, I LOST my new shipment of sterling casting grain somewhere!!). I used a KayaCast vacuum casting setup with a 3.5"x4" perforated flask. I’m also using Kerr Satincast, but have had great results with it on other castings. So a couple of questions:
- Is there a possibility that the longer hold allowed the internal temperature to actually settle at 900°F, making it lower than the Formlabs schedule?
- Is 900°F actually too low?
- Does Formlabs have an adjusted schedule for different size flasks, like Kerr? I frequently cast in a much smaller flask (2x2.5, 2.5x3), but have been running that crazy 14-hour schedule because I haven’t had time to experiment.