Remixed version of the bracket: https://www.thingiverse.com/thing:4754955?fbclid=IwAR2fMJrFSLPuVhr4SiyVIf24xMS_IETlAgnDYD_9GUz-GM5DVZ1ss9b2ioQ
To support holding holding a heater inside the enclosure that has the dimensions similar to: https://www.amazon.com/Safety-Energy-saving-Portable-Desktop-Electric/dp/B075745CDV/ref=sr_1_26?keywords=mini+heater&qid=1637420113&qsid=141-6126594-5420914&sr=8-26&sres=B07DX1L64X%2CB08DFG716Q%2CB074MR2C61%2CB07W4SN7N7%2CB07573FKSG%2CB0058V9SB8%2CB08FHXP7P8%2CB091TF43VR%2CB095P96N7D%2CB09DC41WD3%2CB07XK1R8QT%2CB097M9NRJ9%2CB073CVTSYB%2CB097RG67QB%2CB09719Q15F%2CB096M85BSH%2CB09JZQPHTJ%2CB09L63NCGM%2CB075745CDV%2CB09GZ96LZS&srpt=SPACE_HEATER
I'm also not a modeling expert by any means this was just to get to a functional design that works. The holder will require supports if you can't do long bridging. best printed in PETG since it's supposed to be in the enclosure.