UPDATES AT BOTTOM

This print gives you 6 options of stock length on a Planet Eclipse EMEK. Print the remixed extended BMC back cap and install it onto your emek bolt. Next decide on the stock length you want and print. Long stock is 220mm, short is 200mm. Add an M5 nut and 20mm length bolt. The anti-rotation bars will set the length of pull. If you want a more rubbery stock feel, print the grip in TPU and slip it over the end of your plastic stock.

Stocks - Can print with supports, shouldn't be necessary. If you have adhesion problems with the bottom of the stock, drag it down in the Z axis until its a flat print.
Bar - Normal supports required.
Cap - Could use supports in the center.
Grip - Print in TPU, no supports. Use low infil, cross 3D should give good flexibility.
Gripv2 - fancier, not as soft. print with supports.

I reuploaded the stocks when I added the TPU grip. I'm using a #4 x 1/2" screw to secure the grip. It may not be necessary as the grip holds pretty tight.

This has yet to be field tested, so play hard at your own risk!

Will not work on an Etha 3m. It should work on an Etha 2, but I dont have one to test.

The last file is a buffer tube that should work with an EMC kit. I don't have an EMC kit or any way to test it. If you print it, please leave a comment if it works or not. You should be able to add a regular AR type stock to it.

UPDATES!

I finally got and EMC kit to play around with. I printed the EMC tube as uploaded on March 5th. It fit a Magpul stock very tight, and the EMC very loose. I'm playing around with it in TinkerCAD and will re-upload once I'm satisfied. IT WILL WORK AS IS, BUT I'M GOING TO MAKE IT WORK BETTER. The v2 version of the EMC tube had the EMC interface increased by 1% and the stock portion decreased in size by 1%. This should hopefully alleviate the issues presented in the original version.

The last file I added on 28 March I'm very excited about. It combines the stock I designed with the EMC kit. One thing I noticed about the EMC kit is that it is a pain to take apart, lots of screws, back cap inaccessible etc. So if you use the extended BMC cap (easy access to bolt core), one of the printable stocks (200mm or 220mm) and the EMC Stock Anti-rotation bar or ARB, it makes a nice mix of both accessories. Split your EMC halves, swap in the ARB where the rear cap lock thing is and reassemble. You can even you a GoPro thumb screw on the stock and have toolless takedown in the field if wanted!