How is the build chamber in your 3D-printer heated? Is there any thermal insulation and if how thick is it?
My two cents:
** thermal insulation**
That’s the math for a small 300x300mm printer heated to 70°C (for 130°C tripple this number).
With a 6030 aluminium extrusion a 60mm insulation would fit within the walls and bring down the heatloss to approx. 45W. In other words: Once it is heated up the thermal losses are small enough for it to hold the temperature on its own. Reducing the overall power consumption.
heating/temperature control
For cooling and heating: oil<-> air heat exchanger/radiator might be a good solution:
- place one inside the printer
- the other on the outside
- insert a heater in the loop (only when heating is required, for cooling keep it off)
- possible to push past the 100°C liquid temperature.
Add a fan that circulates the air within the chamber to equalize the temperature.
This way the chamber can be heated and cooled without venting any air into the room.
I do resin printing (SLA) and warmer is always better (within reason). On cooler days I wrap the UV shield with a brewer’s belt (AKA a fermentation belt). Then I cover the whole thing with the cardboard box the printer came in. Works like a charm. The belt keeps it nice and warm without getting scary hot (75-80F or 24-27C). It pulls low wattage, less than most light bulbs.
For filament printing, something similar might work, but I have zero experience with FDM.
You are looking for perfect here where you probably should be looking for “good enough”. You will never build a chamber insulated well enough to hold temperature for hours or even perhaps a 24hours+ without cooling. Plus, you are never going to build a perfect vacuum chamber to prevent fresh air leakage or venting air the hot air into the room and that will also add to the cooling effect. If you have ANY opening or seam, there will be leakage.
Now consider just how big and bulky such an enclosure would need to be with the materials that a commonly available to you that you can afford. Is it really worth it for the small gain in finished product? Even manufacturers of high end printers accept the they will only get ‘good enough’ and that they need to have the heater cycle on and off to keep a steady temperature.
