Summary These are inspired by these http://www.thingiverse.com/thing:731294 but I like my heavy duty ends and the nut holes were way small for the original acorn nuts. I only used a his as a reference photo and nothing of the original model is in mine. These are simply 3 different extensions. 2 short (one 90degree) and 1 long.The short one overall length is 93mm and the long one is 143mm Print Settings Rafts: NoSupports: YesResolution: .2mmInfill: 100% Notes: Only the 90degree one has to have support, most printers can print the other 2 with no support. The hole for the acorn nut is designed to be a very tight fit, you will need to squeeze it in with pliers but then there is no need to glue it in place. Your print may vary of course depending on your settings and printer itself.