Great print, I didn’t have luck with the included PTFE connector - they kept popping off & failing my prints. Found a PTFE M10 Bowden connector coupler that had a internal directional funnel. (Any design that screws in two PC4-M10’s should work) Used a clean up reamer to get the holes just right & screwed in one PC4-M10 to the outside of the box & screwed the couple to that... You should hand tighten the PC4-M10’s & then 1/4 turn them with a wrench. 😮‍💨 Overall, this created a rock solid situation with Bowden tubes… I sealed the IKEA box lid with camper shell gasket material for truck beds. It’s wide & a grey color - you can pick it up at a lumber box store & cut it down the middle for a perfect fit. (inexpensive) I sealed the cord with a wire grommet print - any of them with a slit work - just scaled diameter to 12.7mm as I used a 1/2 inch drill hole. Bravo to the designer of all this - it’s really cool and saved me allot of money vs buying a full AMS lite.