Meet RMG - Rigid Metal Gantry

Meet the rigid metal gantry RMG for the forign 2.4. This project is all about pushing performance as far as possible. And today I'll show you how I designed, machined, assembled, and tested it. A bit of the backstory. This is my Warren 2.4, a machine I run almost daily. At this point, it has made hundreds, maybe thousands of printing hours. A couple of weeks ago, one of my Z belts snapped. And instead of just fixing it, I decided this was a perfect excuse to do something more interesting, a full country upgrade using part that I will design and machine myself. At the same time, I started talking with Isk Tech about putting together a kit. He designed an absolutely incredible motor driver called Our Boros. I will leave a link in the description if you want to check that out. So, some goals were made especially to make future collaboration possible. In case you're new to the DIY printers community, Zoron is a fully opensource 3D printer that anyone can build using offthe-shelf parts. You've probably seen it featured on popular YouTube channels or maybe you already have one sitting on your bench. It's backed by a passionate community of makers who are always happy to help with building, tuning, and modding these machines. For this project, I wanted to build new gantry focused on pure performance. So, it should have 9 mm belts, Y rails moved inside the gantry, shorter belt paths, live shaft idlers instead of fixed to idlers. Before diving into each choice, I want to address something obvious. You might be thinking, wait, I've seen this before. Isn't this basically the monolith country? While I didn't use any monolith cat files, the underlying ideas are the same. Designs like monolith, vizot, and mammoth proved those principles work. And without them, RFG probably wouldn't exist as well. Now, let's break down the design decisions. For 9 mm belts, it is straightforward. Moving from six to 9 mm belts increases stiffness and reduces belt stretch which directly improves motion performance especially when you're trying to push high accelerations with dual motor gantry. Now let's talk about inside Y rails. I'm not a mechanical engineer so take this with a grain of salt but there is my reasoning.