Sapphire Plus - NF Crazy Plus Mount by olevelo

Last crawled date: 3 years ago

I accidentally bought a Mellow NF Crazy Plus, thinking it was just an improved NF Crazy. But it has a completely different mount, and it's longer! So the Mosquito and Clone mounts I was looking at wouldn't work. In addition, there are very few Prusa/Ender type mounts for the Sapphire, particularly ones that don't cause you to loose build area. So I made one!
Thanks to the excellent V6 design I remixed, I saved a lot of time starting from scratch. Unfortunately, I did have to make EXTREME modifications! While in theory the groove mount could be used for this hotend, one of the selling points is one-handed nozzle changes, so I wanted to secure the hotend better. Also, since it's longer, I needed to move it higher, which also meant moving it slightly forward so it could fit under the existing metal bracket. In the end, you gain a couple of millimeters of build space over the stock hotend! And no change in X/Y. Also you save 45 grams in weight!
No additional hardware needed! There are slots for nuts for the heatsink mounting if you decide to use longer screws than come with the NF Crazy Plus, but they're not necessary, and I'm not using them. All 3 stock fans are used, including the 30mm hotend fan. Make sure to turn it around! The stock configuration has the fan blowing away from the hotend; you want it blowing toward the hotend! I also recommend reversing the heatsink as I have pictured so the heater and thermister attach behind the mount instead of underneath. If you want to just use the groove mounts and not screw it together, you may want to use the "tight tolerance" version.
I am using the 3D Touch and mount that was shipped with my printer, which not all have. The screws are long and work to secure the mount from the front as well as the 3D Touch. You may need to procure screws if you do not have this mount. I modified the printable BLTouch mount, however I have NOT tested it! Fusion 360 and STEP files are included if you need to make modifications.
I've included larger fan ducts that are easier to print. I had to print those initially, until I installed the new hotend, then was able to reprint the normal sized ducts which give better visibility and save a few grams of weight.
I modified the fan duct openings from the original design to be more wide and cover more area in front of and behind the nozzle. I also did CFD analysis on the adjustments and results look good. In practice, so far, I'm getting far better bridging than I ever got before.