Chamber heater for X1C. I used the part fan support from the bambu wiki as a basis, so this heater snaps in place and supports the chamber fan. Heater, fans, controller from amazon (also available else where). Here is specifically what I used:

PTC Heating, 24V 100W
https://www.amazon.com/dp/B0BLTZP95G?psc=1&ref=ppx_yo2ov_dt_b_product_details

2 Packs 50x50x15mm 5015 DC Brushless Blower Cooling Dual Ball Bearing Fan
https://www.amazon.com/gp/product/B07SMVPBSZ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1

Digital Temperature Controller STC-1000 Digital LED Display DC 24V 10A
https://www.amazon.com/gp/product/B08BPHL9L5/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1

Needs a 24V DC 6A (minumum) power supply. I used a 10A supply.

Needs to be printed with a high temp filament. I used PAHT-CF (Did not dry it and you can tell from the flaws in my print). I used the melt in place “nuts” for fans and regular nuts to hold the heater in. All 4mm hardware. I melted a hole in the floor of the X1C (using a soldering iron) to route the wires through. BE CAREFUL as you need to clear the belts that are in the bottom of the printer.

It is wired up so the fans and heater come on together. I placed the temperature sensor at top of the print (wire just stuffed in).

NOTE: you have to manually turn this heater on/off so it will not turn off when your print stops.

I am not going to provide more detailed directions - if you don't have the expertise to wire it without detailed instructions, then this probably is not a project for you.

I have not run this up past 55c. In my 20c office, this quickly gets the printer to 45c with the bed heater off. With the bed heater on, has no issue getting to and maintaining 55c. I did set the STC-1000 to have a 1c "on/off window" to help maintain an even temperature.

This fixed my large print warping issues with ASA. Expect it will help with the other high temp filaments I use on occasion.

Ideally a dedicated controller than senses the bed temp and only runs the chamber heater when bed is over 65c or so would be awesome. That would allow “automatic” operation. But as is, this meets my needs.