I have had an F3 multi for a while now, and up to this point I have not had it installed in a shell because I didn't want to sacrifice one of my cartridges for it. I had a little down time yesterday so I took some measurements and whipped up a top shell model. I split the model so each part would fit on my Bambu P1S build plate. I'm printing a set right now and once I can confirm that they fit properly then I plan to upload it to thingiverse.