45 DEGREE (90 DEGREE INCLUDED) PRINTED THREADS

youmagine

Typically, plastic bottles utilize buttress threads. I Googled this and discovered a Solidworks model that I adapted to suit my needs. It performed satisfactorily. The problem with the buttress thread in 3D printing is that they are not symmetrical. One side is 45 degrees. The other side is five degrees. If you can print both bottle and cap with the 45 down, this works well. If you have to print with the five degrees down, this creates some unsatisfactory threads on the overhang. This means leaving a considerable amount of clearance and loose threads. Standard threads are thirty degrees (60 included). I have used them before when something needed to fit to a standard thread. In this application, I am printing both parts. I can create my own threads. I designed 45-degree threads since the printer likes these best. I printed these in high quality. I was able to use .005" clearance on both sides. The threads are very tight. I need .01" clearance per side in low quality. I have not tried normal. I broke the internal threads (outside piece) from the glass first. Then, I screwed it off. You must run the threads up and down a few times to break any strings. Back it out, if it binds. Tread Test-2 has two thread starts. Solidworks: https://grabcad.com/library/45-degree-90-degree-included-3d-printed-threads-1