Tunnel plan Temperature control.

With an electric radiator, the warm air moves from bottom to top.
This happens slowly.
This is more efficient with 5 adjustable computer fans. The fans are activated when the air temperature is above 28 degrees.
The control unit with a thermostat and a fan speed controller is attached with 4 round magnets. The protective grille with the 5 fans also has 4 round magnets with which they are attached to the bottom of the radiator.

See also https://www.thingiverse.com/thing:6418116

Prusa

i3 MK3 MMU 2

No

No

15%

https://www.amazon.de/dp/B08DD9LNZL?ref=ppx_yo2ov_dt_b_product_details&th=1
https://www.amazon.de/dp/B08JPS6DDP?ref=ppx_yo2ov_dt_b_product_details&th=1
https://www.amazon.de/dp/B07WWKCF78?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.de/dp/B09QHVZFRG?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.de/dp/B08QW97D9H?ref=ppx_yo2ov_dt_b_product_details&th=1
https://www.amazon.de/dp/B08JCFHW4X?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://central-heating.nl/products/elektrische-radiator-wifi-2400-watt?sca_ref=3116984.n772mIfXC1