If you’re running a Bambu Lab A1 inside an enclosure, this is one of those “yeah… you probably need to do this” mods. In this video I walk you through adding active cooling to the A1 motherboard area—because (and this still blows my mind a little) the A1 Mini gets a motherboard fan, but the full-size A1 doesn’t. Bambu’s reasoning is that the A1 uses a heatsink contacting the aluminum profiles for heat dissipation, but once you put the printer in an enclosure, you’re stacking the deck against airflow. I show the full step-by-step: printing the MakerWorld shroud (I printed mine in PETG—VOXEL PETG-G in my case), fitting the door piece (I actually had to upscale mine to 102% to get a snug fit), and then adding a simple shim/adapter I designed in SolidWorks to eliminate the big gap behind the 40mm fan. For the fan, I used a Noctua 40mm 5V so I could power it cleanly via USB—no wiring hacks—using a USB-to-fan adapter cable with an on/off switch (and a USB extension if you need it). Big takeaway: you can’t read motherboard temps on the A1 (there’s no sensor exposed), so this is all about adding airflow “in good faith,” especially if you’re enclosing for VOC control, pet safety, and more consistent prints. Also: do a quick wire-management safety check so the cable doesn’t interfere with the gantry harness. Print safe.