T-nut with M5 thread for Prusa Mini extrusions

prusaprinters

<p><strong>Design history</strong></p><p>This design is based on my original T-nut for the Pursa Mini profile, which again was based on the dimensions of commercial metal T-nuts that are offered on the internet. I was impressed myself how strong this printed T-nut came out. The design became very popular over time, despite that fact that it did not have a printed thread.&nbsp;</p><p>By the time of the design I was reluctant to print such a small thread. And frankly, I was also missing the needed expertise and experience with threads. Since then I have done a lot of designs in FreeCAD with threads, so I felt ready to upgrade the design now.&nbsp;</p><p>I have put quite a bit of experimenting in finding exactly the right dimensions for the M5 thread. For a T-nut it is important, that the screw has a bit of resistance within the nut. That is not the case the for most metal T-nuts, which makes them a real pain to use. This design however (when printed on the Prusa Mini from PETG) has just the right resistance to be used without any fiddling.&nbsp;</p><p><strong>Printing instructions</strong></p><p>I recommend to print this design in the uploaded orientation (standing upright). If you are a real dare-devil you can print it without a brim. Being a bit of a coward, I prefer to print with brim and cut it of with a knife after the print.&nbsp;</p><p>It is actually also possible to print it on it's side. In that case no brim is needed. The thread works surprisingly well also in this orientation, but I feel that the thread is even stronger when printed in the upright orientation.</p><p>There is clearly no support needed to print this design, both in upright and side-down orientation.&nbsp;</p><p>To get the most perfect print, I recommend to print several parts at a time, to give each layer time to cool.</p><p>For such a tiny part, I guess it goes without saying that you should print it with 100% infill.&nbsp;</p><p>A normal 0.4mm nozzle works just fine and also the standard layer height of 0.15mm gives very reasonable threads. As the pitch of a M5 thread is only 0.8mm, I prefer to spend a bit more time for the print and use a 0.10mm layer height (which results in 1h40m print time for 9 pieces at a time on a Prusa Mini).</p><p><strong>Please Like it if you like it&nbsp;</strong></p><p>If you like this design please give me a thumbs-up. And don't be shy to share the pictures of your use-case around the Pursa Mini, whatever that might be.&nbsp;</p><p>Happy printing!</p><p>&nbsp;</p>