ScrapHeap's Direct Drive Bulldog Hot End

thingiverse

UPDATE: 11/18/2019 I've finally got this thing tested out. As suspected, the steps didn't need adjusting from the original X,Y and Z. The Bulldog E-Steps remain unchanged. And it works!! Really good too. This is just the next step in design testing, eventually I'll be using this on my scratch-built 3D printer. Here are the Benchy Results: https://youtu.be/LB64avxA-EA I also printed a test cube, measuring .785 - .788, so spot-on 20mm. Also printed a part for my other printer in just 4 hours, no creep and it worked perfectly. Still need to fine-tune the slicer on this new head, but all in all, it performed better than I had hoped. I'm really proud of this one. After spending countless hours getting this to work, I present the ScrapHeap Direct Drive Hotend. It replaces this: https://www.thingiverse.com/thing:3552712 which works great, but I'm always looking for ways to improve. Assembly is straightforward and up to you how you want to wire it in. I wanted a means of disconnecting the entire head and operating on it as needed without the wires. The addition of the 14 Pin Molex Connector achieves this. Design Parameters: 1. Modular a. I want multiple interchangeable nozzles and set-ups, so I only have to change the Z-Offset in the terminal. 2. Easy attachment to the X rail 3. Easily printable with no supports 4. Under $60 5. Utilize the E3D V6 all-metal hotend 6. All 24V 7. Rugged and Reliable 8. Minimize offset from BL Touch to Nozzle 9. Look Cool I think I've achieved this. I'll be posting print pictures as I calibrate everything, but the Bulldog is 107 steps. When setting up the BL Touch, X = -25.5, Y=0 My main concern was the close proximity of the hot parts to the cooling duct and the bottom of the X-Gantry. With the addition of the Silicone Sock, there doesn't seem to be an issue. A laser thermometer reads at 50C with the head at 205C. The only real danger is the first layer when the part cooling fan is off. Once it's on, there are no worries. In the coming days and weeks, I'll post videos of the assembly, set-up and tuning. Assembly in both .stl and .step are included. Happy Printing.