I honestly wouldn't know how to work in this summer without that portable AC of mine... Yes, it costs power. But I only run it when I'm working, only in the office, only to a 25°C target, and it's the most climate friendly option I could find back in 2019 too (R290).

Really happy about an efficiency improvement today! Took the Flir One & scanned my setup for heat creep. Turns out the outlet is fairly well isolated, but the hose turned out to be leaking some air & also radiating heat. Duct tape + blanket ftw! Achieving 10+°C difference now!

And thanks to everyone who pushed me in the direction of a dual hose conversion again. I'm still not convinced I can make that work in my room & window layout, but considering the heat & energy prices these days I'm going to give it my hardest try. Wish me luck.

Definitely consider this (accidental*) dip to 23.4°C with an outside temperature at 34.5°C (measured on the north facing front) my biggest win of today! 😊

* Why accidental? Too low target temperature set 😬 Doesn't exclusively happen with 3d printers 😅

New backplate for the AC to convert it to a dual hose setup, all parts printed over the last few days and now epoxying together. Thankfully did not have to design this myself, someone already did and shared 👍😊 thingiverse.com/thing:5421906

Just hope it really fits 😅

After just now disassembling the backplate and comparing things directly I'm very optimistic that it will indeed fit 😊

And the new window adapter plate is making progress, almost done, just needs some sealing on top and a coat of varnish 👍

Next step is weather proofing the outlet setup. So I just got to work on the balcony (last chance for the week to use it, will turn into an oven tomorrow again thanks to the heat), sanding and putting the first coat of varnish on the board.

End result, including some sealing tape on top for a better seal against the shutter. Currently doing a first test run (with the 2nd hose just fiddled through the opening due to lack of an adapter). It was very tough to fiddle two hoses through the limited space, but I won!

Currently the two ports are very close together, so to reduce the likelihood of sucking in the exhaust air the plan is to print two redirection thingies that slot into the little rail there in front of the ports, to direct the airflow to opposite sides.

Will have the added benefit of being able to throw some mosquito netting on those covers to keep insects and debris out of the intake and exhaust. The intake already has got netting on the backplate, but I'd also like to keep the hose clear as I store that inside when not in use.

Printing these almost drove me crazy (adhesion issues, support issues, ...) and they are far from perfect prints (and two iterations of the design), but they fit and work beautifully. Vent covers redirecting the airflow to opposite sides, and mosquito netting behind the fins.


@foosel My only concern with printing the vents would be the heat on the outlet vent - what filament did you use for them?

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@peter Extrudr Biofusion, claimed to be mechanically stable up until 75°C. I share the concern, this is a test. If it doesn't work, next attempt will be ASA, though I haven't tried printing with that stuff yet.

@foosel @peter Well, the exhaust air should not even remotely reach 75°C probably... So should be good .... maybe it might sag a bit when exposed to direct sunlight addidional to the exhaust air.... but .. well ;)
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