it will also be a good test to see if i have any heat issues with the retainer melting on the PEEK

I made a similar thing a few days ago
http://www.thingiverse.com/thing:89216 - Lawsy MK4 Peek Retainer

I wasn't so much worried about retaining the ability to use attachments, but I can say that I haven't had any issues with it melting where it's in contact with the peek. It's just about as high up as the retaining bar on the mk4 body so id be surprised if i did.

i couldnt seem to stop massave amounts of wobble on this set so i thought i would make a suport that also kept the accessory clip....

find it on thingiverse

thing:89783

i hope it helps anyone with the same problem...  im now printing myself a set at 0.1mm 100% infill,

100% infill isn't necessary, and will actually make it harder to print.  This is because parts tend to warp more at higher infill levels.  You should be able to get a very strong part at 40% infill.  Just a recommendation.

find it on thingiverse

thing:89783

i hope it helps anyone with the same problem...  im now printing myself a set at 0.1mm 100% infill,