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.