This is a version of the wade extruder that has the hole in the bottom modified to accept the commonly used 1/8th inch x 4mm pneumatic fitting that holds the bowden tube for 1.75mm filaments. The fitting can be found on ebay, search "10 x Straight Quick Connectors Pneumatic Fittings 4mm x 1/8" PT Male Thread" It is a very tight fit, you will probably need a socket wrench with the correct socket to install it but it will be very strong when assembled. I put this on the top of my mini kossel and it works great. Other parts are the same as the original wade extruder. Enjoy! I printed it with 3 perimeters and 50% honeycomb infill but other settings will also work.