Surface finish help

Should I join it here to reinforce or only vent out the top?

 

I have a second one in there. I'm going to glue it up and start dipping.

Thanks,
Kevin

 

Wow, you're fast. Keep a full basin. I'll see if I can find a horn gate if your connection through the injector boss causes problems.
This is the windmill gear in cast iron with the horn gate.

 

Good to hear. You'd be surprised the amount of trouble people that get into when melting stuff that belongs in the trash!

 

That defect is an innie.. Cracks usually leave an outtie.. Insert belly button reference here.

 

I keep thinking of bubble trails from aspiration, but then Kevin mentioned finding debris in his last mold.

 

In my deeply unqualified opinion that is crap floating around in the mould. ~I have never seen Jason's outie, nor do I want to.

 

That is where the debris was, but I didn't find it filling all of those craters. I opened it in the yard so I don't have an inventory of everything that came out. Here is the piece from that side. It matches the model. There's no crack or spalling there. The lines in it are from the 10% infill. They are visible on the casting.

Kevin

 

Hopefully tomorrow evening. I usually lay them on their side. My prints are 1mm thick (1mm nozzle) with 10% infill. When burning inverted, I've never seen anything melting out. It looks like it soaks through the shell. Colored pla and abs colors the shell before burning away. I only print in white now.

 

It is a definite possibility. I haven't logged heat up time, but it's pretty fast. Maybe an hour to get to 1800F. Then I hold for an hour. I can turn it on, go inside, get my molds, and it's 500F by the time I get back. I'll look for natural pla for my next order.