IMO the pollution isn't big at all, at first I did clean it every day, but so far is been 4 months since I did clean them (on 3 machines 1.75 version with my FatIRobertI mod) and I got zero issues. But indeed I use a stronger spring, but I never never tight it, I adjust it enough to keep it there, also I done lots of crazy retractions and it performs flawless. On UM2 afaik to avoid filament on the bolts is important to lower the amps of the motor since the default of um2/um2+ is too much for the planetary gear motor of the bondtech standard kit.
Also about um2+ I'm making a mod, reusing my basic FatIRobertI design and will use a new metal bolt. This way I want to transform the um2+/um3 feeders to bondtech using the cheap 45€ dualdrive gears.
I just started this evening, so it still has much more work to do. But since the um2+/um3 spring is the same of the old um2 (more or less) it should be quite easy to reuse most of the important parts of the feeder and install a bondtech more enclosed extruder (for flexibles) and with a more classic IRobertI feeder style with a fast filament release. What I want to work is a easy to open door, so everything is more accesible, and making it more easy to open unlike um2+/um3 feeder that need's some time to open it (releasing the tension, unscrewing x4 screws and it has small parts that are easy to misplace).
Edit: This mod was finished a few weeks ago
It will have more updates in the next months, to make it smaller, just becauseEdited by Guest
This summer I bought one form Carl / 3Dsolex, just because I was curious about it. I run it on one of my UM2's for a few months now. And though I'm probably not the most interesting person to give feedback as I didn't really torture test the device I have two remarks concerning the bondtech.
I find the Quick Release to be useless with the short spring you deliver with it. I always have to almost totally unscrew the screw to be able to use the quick release. People tell me I can replace the spring with a longer one... it's still on my to-do list but I think you should really deliver a longer one with the feeder.
2th and more important issue is the driveweels get polluted with plastic over time, and it's a pain to clean them. It's expected this type of drivewheel to pollute more than the knurled wheel of Ultimaker, and the front one is pretty easy to clean, but the one in the back is a pain in the @$$ to reach ( any tips here?
So overall do I like it? yes it's a nice piece. Do people need it? well I guess most UM2+ users don't, I think the new + feeder works fine for 99.9% of the users. For people with the old UM2 feeder it's a very nice option, specially since Ultimaker is making it much to difficult for people to just buy the + feeder (some re-sellers sell it, some don't...)
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