Bondtech BMG thoughts

dvdsnyd 2018-11-16 02:57:18 UTC #1

Hi, I have a E3d Titan extruder on my FT5. For the most part it works pretty well. However, it creaks and squeaks and can bit a bit fiddly at times. I am wondering if anyone has gone to the Bondtech BMG in any of their builds and would be willing to share any experiences both positive and negative?
Thanks,
Dave

jamesthomas128 2018-11-16 14:31:18 UTC #2

I use a BMG on my FT5 and it is absolutely awesome. I would highly recommend it.

The main reason that I chose the BMG was the dual drive (better for flexible materials, and just more consistent overall) and the high quality drive gears (I print abrasive materials, like CF).

Wyvern 2018-11-18 21:48:36 UTC #3

I was seriously considering a geared setup (probably Titan) as very thin layers at low temps can cause all sorts of issues, however, after fitting a Vocano hotend I have no reason for one, since the heat chamber is so long the pressures are dramatically reduced, I can print with a .6 nozzle at .1mm layers without so much as a single skip.

For an I3 rig I would run bowden and a geared extruder and have all the torque in the world.

I'm kicking around the Idea of a titan with a pancake stepper flying extruder setup for my delta, I have a regular flying setup, but the reduction in weight would help speed/fudge up torque (nozzle hitting print and skipping)

jsprecker 2018-11-25 14:41:14 UTC #4

Make sure your bearings are good and there is a small amount of end play in the filament drive cog/gear shaft. I have considered BMG because of TPU is picky. But I can get it to feed reliably.

dvdsnyd 2018-11-25 16:14:07 UTC #5

@jsprecker,
I think you nailed the head on part of the problem I was dealing with.
The bearing on the rear part of the titan housing was completely shot. The bearing on the front lid isn't a whole lot better, but spinning. After I disassembled, I could hear the squeak when rotating the hobbed gear in the rear bearing by hand. Luckily, I had enough parts on hand from a titan aero that I never installed. I think I'll get a spare lid with bearings/hobbed gear, which will be cheaper than the BMG. I'll have to see how the titan ultimately holds up.
Thanks for your help!
Dave