Piper2.2 BMG DirectDrive mount (16mm and 15.1mm bearing slots) (WIP)

thingiverse

**Current version as of November 7, 2021** -- Added lower retaining clip with integrated part cooling fan mount on both ends, because using the extended one from before blocks placing the fan mount. Put the mount on both ends to leave an empty spot for an additional part cooling fan or possibly a bed probe mount in the future. -- No longer need the upper retaining clip, as the threaded spacer combined with the longer lower clip eliminates the need for it. The threads are coarse threads, and the V6 extruder is fine thread, but it will still thread together securely. Will have to back and update the threads to fine thread, though they print more easily with coarse threads. -- Left in the original unthreaded spacer, in case anyone wants to use it with a different hotend and can find a way to make that work for them. The default Piper 2 X and Y carriages and my linear rod bearings were NOT playing well together. I had to reduce the ID of the bearing slots in the X and Y carriages from 16mm to 15.1mm While I was at it, I threw together a quick test BMG direct drive mounting version of the X carriage. There's a 3 part setup here. The standard X carriage lower, the upper X carriage which has the mounting bracket for a BMG, and the J-head spacer, which should hopefully keep the 3mm thick motor mounting bracket from bending and flexing. You'll want to print one additional copy of "gantry-X_carriage-Heater_holder.v1.2" in order to clamp this into the upper carriage. The BMG *should* fit over it as if it were any other hotend with the mounting style of a V6/Volcano/etc. Also included are the standard X and Y carriage STLs with the bearing socket/slot reduced to a 15.1mm bore vs a 16mm bore, and a 15.1mm X carriage with the bracket for the BMG. If you've got slop in your bearings with the standard models, these gently modified parts may be of some use to you. ** Updated the spacer block so that it will fit inside the mounting clip ** -- ** Yet another UPDATE ** -- Found that the original design made it impossible to screw the retention clips in place on either side of the carriage. I've changed from a spacer that passes through the carriage entirely and threads into a V6 heatsink. This still left the issue of not being able to attach the clip with screws, so it's been lengthened to reach the furthest outside holes on the carriage. This may or may not interfere with hotend fan and part cooling fans, etc. I don't know for sure yet. WIP, remember? :) Current installation is to place the threaded spacer into the BMG. Drop BMG/spacer through the carriage so the threaded end sticks out the bottom. Place the long retention clip over the V6, and orient it so it fits between the belt adjusters to give clearance for the belts. Thread the heatsink on to the spacer, and run your bolts through the clip to keep it locked in place, which will keep the heatsink from backing off the threads during print vibration. Screw the stepper motor to the extruder last. Pray that the fan situation isn't a nightmare, because I haven't gotten that far in my assembly yet. XD