I have one of the early Kickstarter models that I finally got around to setting up and running this week.. I had tried a first test print last year with the included sample of PLA just to see if the printer worked and it did, but needed a lot of setup/tweaking which I was too busy to do at the time.. Fast forward to last week and I ordered some ABS and downloaded the new MatterControl software, which is a big improvement over RepetierHost, (although I have an occasional problem with .NET crashes- looking at the system app error logs, it appears as though extraneous multitouch events from my touch-screen may be causing some unhandled exceptions in MatterControl's UI).. Anyways, after tiptoeing around the laptop to not accidentally introduce spurious events that would crash the software and trying more prints, I found that my heated bed would heat to some degree (but never even getting close to the 120C ABS preset in the software), and then stop working.. Perusing the troubleshooting forums, I found that it's the PTC causing the issues.. I decided to replace the PTC with a straight fuse as even a higher-rated PTC has a voltage/current drop and I wanted the heater to be able to get as much power as possible.. Unfortunately, even without the PTC in the circuit, the heat bed struggles to get to 100C, and takes a long time to crawl up a few more degrees to about 111C peak, and about 105 with the extruder cooling fan going 50% speed.. Long story short, I may still have to play with extrusion temp settings (I'm running 220C vs. the lower temp originally in the preset as I was getting some layer-to-layer bonding issues) and layer thickness settings, etc (any suggestions for optimum settings for ABS, please PM me), but even with the bed at 105C, there is some distortion and warping going on with the ABS (it's not bad, I printed a couple of fan brackets to cool the ramps underneath and they came out quite well- but there was a bit of lifting at the corners, despite printing the skirt right up on the bracket; without the skirt connected, the parts lift off the bed with ABS "juice" or pull the tape up off the bed) despite the heat, so I was thinking about a cover over the build area as well to keep the heat in.. This brings me to my question though: because of the high current demands of both the extruder and the heat bed running essentially a max, the power supply cooling fan kicks in occasionally, and I note that the hole for the fan is on the inside of the enclosure- is this an inlet or an outlet? My concern is that if it's an inlet, I would want to cut a hole out the side of the enclosure and put a duct on the fan so I'm not pulling in hot air, but if it's an outlet, I could potentially just vent it inside the enclosure which should actually help keep everything warm..