Original Prusa enclosure automatic heating, venting and filtration

The original design by Lars is excellent, however, I don't always have time and such which is required for such a project with the welding, programming etc, and also wanted to add filtration as a possibility.

The system has heating to avoid influence of low ambient temperature mainly used during winter to ensure the ability to start a print with out manually heating the system.
It has cooling in the form of venting to remove hot air from the enclosure.

Lastly filtration is added using again a temperature controller and having venting kick in once a chosen temperature is reached so it can be specified to only start with fx ABS prints or other higher temperature materials.

All of the above mentioned control temperatures are controlled directly on the temperature controllers and can easily be adjusted if need be.

Therefore I replaced the Arduino for heating and venting with a STC-3008 and added a W3230 or W1209WK for filtration control engaging once enclosure temperature is at a predefined temperature.

BOM for project:
1 pcs https://www.aliexpress.com/item/32552473578.html?spm=a2g0o.order_list.order_list_main.66.57e51802se18Vq filtration fan 24V, suggest dual ball bearing
1 pcs https://www.aliexpress.com/item/1005006060817537.html?spm=a2g0o.order_list.order_list_main.242.57e51802se18Vq Vent and heating temperature controller
1 pcs https://www.aliexpress.com/item/4000393297564.html?spm=a2g0o.order_list.order_list_main.1462.57e51802se18Vq Filtration controller 

1 pcs https://www.aliexpress.com/item/1005006272872579.html?spm=a2g0o.order_list.order_list_main.71.57e51802se18Vq if you desire blower rpm control for the filtration fan (3A 6-28V)
1 pcs https://www.aliexpress.com/item/1005004061262599.html?spm=a2g0o.productlist.main.19.7449LoGOLoGOi9&algo_pvid=ec3a4191-af17-41bb-8a82-2d87ad09932c&algo_exp_id=ec3a4191-af17-41bb-8a82-2d87ad09932c-9&pdp_npi=4%40dis%21DKK%21109.01%21102.47%21%21%21113.50%21106.69%21%40211b813f17277274244248071e7f29%2112000027904054857%21sea%21DK%212328166673%21X&curPageLogUid=JOypEm5BB1ZA&utparam-url=scene%3Asearch%7Cquery_from%3A 24V 150W heater
1 pcs https://www.aliexpress.com/item/1005007234003604.html?spm=a2g0o.productlist.main.1.7831I9ioI9io3U&algo_pvid=f1ae987f-70f9-475f-bd18-8e20844784ce&algo_exp_id=f1ae987f-70f9-475f-bd18-8e20844784ce-0&pdp_npi=4%40dis%21DKK%21413.56%21247.29%21%21%21430.61%21257.48%21%402103872a17277275198063538e905d%2112000039900496450%21sea%21DK%212328166673%21X&curPageLogUid=iVwIE7QjlZyP&utparam-url=scene%3Asearch%7Cquery_from%3A Power supply, 24V 200W

1 pcs https://www.aliexpress.com/item/32858513094.html?spm=a2g0o.productlist.main.3.a8f6L8ckL8ck2K&algo_pvid=2e33d331-05ca-4bbd-aaef-68a64c243504&algo_exp_id=2e33d331-05ca-4bbd-aaef-68a64c243504-1&pdp_npi=4%40dis%21DKK%2125.63%2123.03%21%21%213.75%213.37%21%402103856417290228881514314edc89%2112000024367989964%21sea%21DK%212328166673%21X&curPageLogUid=mk8aVK1Rihkq&utparam-url=scene%3Asearch%7Cquery_from%3A ventilation fan 24V, suggest dual ball bearing

Note all above parts are just what I found or similar to what I used.

Add a thermal fuse to the heater housing if desired for safety.
 

At the outlet the magnetic cover can be mounted on top of the 60mm extraction fan and making a custom cover for it. Will make one in the near future.

The filtration fan print is currently designed for zortrax filter solutions instead of the one from Prusa, this could be used if desired so, else, feel free to contact me to draw another custom filter solution if need be. The printed part have two holes added at the blower outlet to be able to add a outlet flow guide to reduce influence on bed temperature control if it's an issue.

An example of operational pattern is given in the following.

Minimum temperature set point: 20C

Filtration temperature set point: 35C

Ventilation temperature set point: 38C

Ambient temperature is 5C Celsius and the system is turned on heating it up to the specified temperature of 20C. The print starts and the filtration engages as the enclosure temperature reached 35C. During the print the enclosure temperature reaches 38C on occasion starting the venting fan which cools the system down to below 38C and disengages until the temperature increases again.

Once the print finishes the ventilation stops first if running as no more heat is added, then filtration stops and lastly the minimum temperature will be kept until the system is powered off.

If you don't want to filter the air just forget about the filtration fan, filters, controller, fan speed controller and the printed part.

Electrical drawing of how to connect it all together coming soon, however, its quite straightforward just look at the diagram for the controllers supplying power to the different fans/blowers.
Note the wiring in the pictures are a much bigger mess than what could be achieved, will make the same mod to my other MK4S and will add another to show the cleaner look.

Removed the entire Arduino setup, the switching vent clap and most of the electronics.