Sorry that you experienced a failure in the mount. I incorrectly specified a requirement to use PTEG or ABS if ambient temperatures exceeded 100°C. The temperature should have been stated as 50°C. This has been corrected.
The Tg (Glass Transition Temperature) of PLA is only 60°C at which point the material will become very malleable and is easily deformed by the force of gravity on the filter as can be seen in your photo. The mount in my printer is made of PTEG. Depending on the type of material I print, the enclosure temperature varies from 35°C to 60°C. The mount has been in place for more that 1 year and is showing no signs of deformation.