Carriage for BMG and BLTouch with Duct and RJ45 mounts, "Over the Top" Style

thingiverse

Human: **NOTE:** There is a revised version of this, which I'd recommend over this one, at https://www.thingiverse.com/thing:3688067 , best used with the duct design at https://www.thingiverse.com/thing:3687678. It provides a more easily serviceable assembly (duct assembly just snaps on and off for easy access to nozzles and hot end stuff). The design here might be preferable if your printer doesn't have the space for the slanted fan design of the new one. **I'd recommend that newest version instead for better rigidity and simpler printing and assembly! This older version left for reference**  **new version^^** ___________________________________________________________________ This is designed for a Folgertech FT-5, but might work on other printers that use an MG12H slider on a 2020 bar. It is designed with these priorities: 1) keep the nozzle close to the MG12H slider to minimize any effects of bearing tip. For that reason, the BMG extruder (operating direct) and motor are place above the 2020 bar, rather than the conventional placement (below the bar). 2) duct fan must be adjustable in height so standard V6 or Volcano hot end can be used; with guides to keep everything rigid and oriented 3) BLTouch mount also adjustable in height with guides on the slider 4) Include a set of RJ45 sockets to simplify wiring (using the MDFLY dual RJ45 board w/screw terminals) The "Over the Top" (of the 2020 bar) mounting is done because I don't like having the nozzle hanging down multiple inches from the slider bearings, which would happen with the normal mounting of motor and extruder below the 2020. The Titan Aero feels and behaves so nicely with the nozzle up closer. So this is my attempt to get the best of both worlds -- the tight minimum-lever placement of the nozzle along with the BMG's dual gear extruder. BUT, this causes another difficulty -- on the FT-5, with this new mounting, the bed won't reach up to the nozzle! The nozzle (with a standard V6 hot end) sits only 10mm below the 2020 bar. So the bed has to be raised some (about 45mm from the melamine bed platform with standard V6, about 37mm with a Volcano). That shouldn't be hard to do with some pieces.... https://www.thingiverse.com/thing:3518065 You'll also have to lose the "X" cable chain, but I don't consider that a loss at all, I hate those things! Better, IMO, to just spiral wrap the cables and feed them from the top side of the chassis. There is enough room with this setup to grab the heat block with pliers and unscrew the nozzle for nozzle changes without removing the duct -- I checked. It is set up for a short NEMA 17 motor (part number 17HS10-0704S, but should work with the smaller pancake, too). If you use a longer type motor, the B(Back) piece will need to be modified or cut. There's a drawing supplied of the printed parts, showing how they are arranged during assembly and what screws to use. The order of assembly would be: 1) bolt part G(duct) to part D(PartFanSlider). 2) bolt part F(BLTmount) to part A(Plate) 3) bolt the A(Plate), C(MGN12H_Interface) and B(Back) together (don't tighten yet) 4) attach H(RJ45mount) to A(Plate) using short self-tapping M3 or #4 screws. the MDFLY RJ45 board attaches to part H using shorter self-tapping screws. 5) then build the rest onto the slider and 2020 bar. I don't expect anyone to actually build this since it's so specific (printer type, extruder type, odd mounting. BLTouch). But if you do, please leave a comment and maybe a photo and let me know if there were any issues I haven't thought of yet. [there was an oops in the "Duct" file, a bump should've been a hole..... fixed on 3/21/2019 https://www.amazon.com/gp/product/B01KHMFH1M/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1