The file 'Towel Stopper – Light – For Sand Beach 3D Printer Model' is (stl) file type, size is 192.1KB.
I simplified and made a smaller model of the original Beach Towel Spike by MrSkippy, so now it'll need just 5gr (5 times less) and a lot of less time for printing.
It has less "downforce" to stop your towel but it should be fine with the right sand and when there's not a tornado around you.
Towel_stopper_for_sand.stl | 452.9KB |