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  1. #11
    While waiting on the new temperature sensors I thought I would do a little bit of a design sanity check. I modeled the house in one piece as 3-4 cylinders at the final height with no internal bracing, no textures on the walls, and no seams at the interface. The idea being to measure how much cost is involved in my design work, vs just the cost of printing anything of this relative size.

    To analyze the results I created a fake printer with a 800 mm cubed build volume, big enough to print all the parts out. The numbers below are what cura reported for this virtual printer to print the design. The times are all quite long because I used a much slowed down profile that I'm currently using with my ender3, a better tuned printer could take less time. However what matters is the relative change not the total time taken.

    Here are my results for both the 2 chamber and 3 chamber houses:

    3 chamber
    - Simple 4 walls, slow speed
    315 hour print time
    3633g / 1218m material

    - Full model 4 walls, slow speed
    412 hour print time
    4044g / 1356m material

    - Increase by
    31% more time
    11% more material

    2 chamber
    - Simple 3 walls, slow speed
    136 hour print time
    1569g / 526m material

    - Full model 3 walls, slow speed
    183 hour print time
    1801g / 604m material

    - Increase by
    35% more time
    15% more material

    Basically the cost of finishing the design is not a big deal, it is the overall size and shape that dictates the cost and print speeds. This was all done with 4.5 mm thick walls. I could go down to 2.4 mm thick walls to see if that speeds things up any. With a 3 shell thickness that essentially results in solid walls with no infill. Infill is set to 20%, so the savings can't be too great, but it may speed things up by a larger amount.


    Edit, I ran a quick test and reducing the walls to 2.4 mm reduces both the material cost and print time by about 20%, basically the amount of infill in the walls. I will do some strength tests to see if reducing infill has a significant impact, a 20% savings is not amazing but definitely worth something.
    Last edited by reality_boy; Yesterday at 04:52 PM.

  2. #12
    My thermisters came in, I picked up 8 thermisters with 3 meter cables that are housed in metal pipes and epoxied into place. That should be safe enough to leave in the house even with bats (if I ever get so lucky to have bats). The up side is these are dirt cheap, it cost $9 for 8. The down side is you need a MUX or a device that can log analog voltages from 8 or more inputs, and they are uncalibrated so I have to go through that step.

    I'm still waiting on my i2c temperature probes. I went ahead and picked up 8 of those as well, at around $30. The nice thing there is they can share a single wire for the data bus, and are easily to gaing together. They are also calibrated and have there own 12 bit A/D converter built in. The down side is the cost and the slightly larger size. Also they are exposed, so I would need to print a housing if I was to leave them permanently in the house. For now they are good enough.

    I also picked up several light sensors to see if I could work out the thermal load on the house. My light sensor from above is not good for much more than a binary on/off value indicating the sun is up.

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