![]() The 3D Printed Hamel Monohull Paddle Boat a Basic Press-Fit DesignĪs one of the organizers for the Moat Boat Paddle Battle held at the Bay Area Maker Faire this year, I was on the hook to design a 3D printed camera mount for the race course. a different printer, different material, different orientation) left me guessing what that right clearance should be between the pin and the hole. length or diameter of pin) or printing conditions (eg. I have used this design in a number of projects (like the purple paddle boat) and it works just fine if you’re willing to go through a few design iterations, but what I found was that any variation in design dimensions (eg. Round Pin / Round Hole Press-Fit DesignĪfter no fewer than six tries resulting in too loose or too tight of a fit, I finally zeroed in on the perfect sized pin. I also added chamfers to the ends of the pin and the two mating pieces. I added a flat spot to a slightly undersized pin so it would print horizontally, but this is essentially a round peg / round hole design. Let’s start where I started a few years ago when I got my first 3D printer, with a basic and seemingly obvious press-fit design that looked a lot like what you see in this figure. Lastly, press-fits are an entirely 3D printed solution so you don’t have to worry about having the right hardware on hand. I like press-fits because they are easier to draw in CAD compared to snap-fit and they avoid the necessity of glue but also don’t preclude it. There are several different ways to do that, of course, but I’m going to focus on the press-fit option for now. You’ve designed some parts but, for one reason or another, those parts need to be assembled after they come off of the build tray. Instead you’re limited to what you can do on your new 3D printer. Let’s say, hypothetically, you don’t own a machine shop. When it’s time to assemble the parts, a hydraulic press, liquid nitrogen, or torches can get involved. The exact dimensions and tolerances required for a permanent or semi-permanent fit are called out in any number of references, and they are easily achieved with a drill press and a lathe. To be completely fair, a round pin and a round hole is exactly what you want for a typical machine design application where the parts are metal. When you’re done reading this, you’ll have a basic toolbox of design ideas that will help you make press-fit pins that fit the first time, every time. ![]() While that may be true in a number of metaphorical and literal applications, I’m about to argue that when it comes to designing press-fits for your 3D printed projects, a round peg may be the last thing you want for an easy, predictable, first-try-fit into a round hole. There’s common adage that you shouldn’t attempt to fit a square peg into a round hole, which seems to imply that you should use a round peg instead. Graphics and More to Help Spread the Word Learn More About the Amazing Maker Awards The top projects selected by community votes, panel judges, and the editorial team Subscribe to the premier DIY magazine todayĬommunity access, print, and digital Magazine, and moreīrowse all the projects and learn about their makers too! Skill builder, project tutorials, and more Get hands-on with kits, books, and more from the Maker Shed A project collaboration and documentation platform.Membership connects and supports the people and projects that shape our future and supports the learning initiatives for the next generation of makers.A free program that lights children’s creative fires and allows them to explore projects in areas such as arts & crafts, science & engineering, design, and technology.Maker-written books designed to inform and delight! Topics such as microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more.A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more curated by us, the people behind Make: and the Maker Faire.A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers together tech enthusiasts, crafters, educators across the globe. ![]() ![]()
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