Here a remix of the TL-smotther housing for Ender3 PRO to accomodate 4 modules.
Unfortunately the orginal design was based on different tl-smoothers (different size).
NOTE: you need to trim down the pins of the tl-smooter (flush with the PCB surface)
MODEL: BIGTREETECH Smoother V1.0
Due the sizes of these modules, I thinned the side walls of tl-smoooter housing gaining the space needed to accomodate 2 fans as the original design.
This model has not been tested, first, try to print the test model (TEST_HOLDER 48x25.stl) to verify that the module fits, than proceed with the full housing print.