Stomp Pad MK II

Hi All

Here is MK II of the stomp pad, the idea hear is to print the face out of a flexible material and the inserts out of ABS or PLA.
As i only have 1 extrude and no flex-able print material at the moment here are the files to play with.
i tried to combine them as one STL so it could be printed with duel extrude, but it saves them as separate files mm Im working on this?
I have added them all in order, as i believe slicer will combine them? will test this when i am home again.