Also looks like there was 0 compaction. Judging by some of that resin, it looks like there was way too much space in the cavity, like 1-2mm too much.

Doesn't look too good in my opinion. Did you restrict the resin flow? Seems to me that the resin went far too quick through the cavity.

I made a test piece during the weekend. I printed the female molds from PLA and the core from PVA and instead of spirals I printed a part witch resin channels guiding the flow from the resin hose to the two bottom sections of the part. My Sp115 resin seemed to work fine - to make it more viscous I heated the mixed epoxy in a warm water bath. The trial was partly a success: the inside surface turned out perfect but the outside didn't. The surface areas where the print layer imprints are visible worked as intended but the majority of the surface didn't. I'm not completely sure why - one reason was probably because I didn't use enough fibers so the core was really loose inside the molds. Also I forgot to wax the molds so I think the surface epoxy sticked to the molds instead of to the fibers everywhere. But there doesn't seem to be any dry spots which is good I guess. I didn't degass the resin before infusion so there are some air bubbles in the good spots. Any thoughts?

If the mixed viscosity on the data sheet is higher than about 550cps, it wont work well. Infusion resins are around 150-300cps, low viscosity hand laminating resins are about 400-600cps, and regular laminating resins are usually above that and won't infuse well.

Yes, low viscosity is crucial for good fibre penetration. But most regular epoxys are not that much more viscous than infusion resin and work ok. Middle viscous resin won't work.

Thanks for the help, makes sense that you have to first suck the air out and then let in the resin. I think I'll try oekmont's suggestion and bag the molds and infuse it from the bottom. I'm going to try with a small test section first. I have some SP115 epoxy (non infusion resin) already past it's expiry date - I wonder if that would work or is the low viscous infusion resin a must for any kind of infusion application?

Sorry, i misread your post. Light RTM is processed without pressure on the resin, wich is the difference to regular RTM.
Yes, overpressure will be difficult for printed moulds. You could do it, but those moulds would not fit well with the lost plug idea. But you can get good results without pressuring the resin.

I was referring to the printed moulds not withstanding typical pressures of 2...3 bar of pressurized resin when working with vrtm, which is not the same as the hydrostatic pressure of a vacuum bag.