MMU Slot buffer

thingiverse

Hi everyone, I'm excited to share with you the latest design of a MMU buffer that's been in development for quite some time. You can find original overview drawings in PDF format within this file, in full resolution. I'd like to extend my gratitude to Juergen G. for helping me test print and refine this FINAL version from its BETA predecessor. As someone who frequently switches between different filaments during printing, I wanted to create a buffer system that would make the process as quick and seamless as possible. The previous design had two doors on top, but it didn't quite meet my expectations - while it was easy to change filaments, it wasn't ideal for preparing another filament for the next print. That's when I came up with the idea of separating the filaments within a single box. This design uses printed dividers and click system with 5 slots for different filaments, keeping everything organized and clean. Here's how it works: First, you place a spool holder in each slot, then unreel enough filament to reach inside the corresponding slot inlet side. Next, insert one end of the filament into the outlet hole, push it almost all the way to the MMU unit, press the load button on the MMU unit, and finally push the filament in. Let the MMU unit load the filament, then slide the slot back into its original position, creating a nice loop of filament inside the buffer. You're now ready to print! To remove the filament, simply change the filament number on the MMU unit and wind up the excess filament back onto the spool. That's it - happy printing! For those who printed the previous BETA version, don't worry - this FINAL version is compatible with most of the same parts. However, there are some key differences between the two versions. The main difference lies in the width of the buffer itself: the BETA version is 60mm wide and suitable for standard 4mm tubing or Festo fittings with a spanner size of 8mm and M5 thread. In contrast, this FINAL version is 70mm wide and can accommodate both standard 4mm tubing and PC4-M6 fittings with a spanner size of 10mm. Here are the parts you'll need for the FINAL version: There are two types of SLOTS: one designed specifically for normal 4mm tube and another for fitting PC4-M6. You also have three options for Slot handles - standard, vertical hole for filament, or horizontal hole for filament (thanks to Juergen G.). The dividers were printed using Prusaslicer 2.1 modifiers with impressive results. If you're interested in replicating this setup, I've included a configuration file for Prusaslicer 2.1 .3mf. Other materials required include: * Bolts - 4 pieces M3x30 mm * Bolts - 12 pieces M3x10 mm or optional 10x PC4-M6 fitting * Nut - 1 piece M3 I appreciate any contributions or tips, which can be sent via PayPal to support further development and testing. Thank you for your interest in my work!