Critique my BLV cube toolchanger draft!
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@I_Jedi Thanks!
And yeah of course, all open source! It will be on https://github.com/tanaes/BLV_MGN_cube-remix as I go. It’s a bit of a mess but if you want any help finding things, or a Fusion or STEP export, just ping me.
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@whopping-pochard Outstanding, thank you! I am close to bringing my 're-mixed' BLV MGN online. (remixed as in borrowed ideas from all over the smashed them together in 3Dbuilder since I have no CAD skills
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@I_Jedi There are a lot of modified parts in there that are basically just the original, but edited a bit for better printability / assembly. Most of the holes in the original STLs aren't the right tolerance, and there are a lot of unsupported overhanging holes. Anything in the "jon's mods" folder should have correct hole tolerances and single-layer sacrificial bridges to support overhanging holes. I also remade the front corner belt tensioners so they go on a little easier, are identical (just rotate, and screw on the cover 180°), and can be printed easily without support.
Happy printing!
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Oh i'm blushing so hard to see my design here!
the idea of using block magnets like that on the other side too (instead of balls) is honestly clever too no idea why i didn't think of that 
it will save space and have more "suction". tho I worry it'll cause some alignment issues :?btw for a direct drive tool I suggest a middle ring magnet.
the ball/block design I had did handle the weight but it'd fly off at high speeds. but with an additional magnet it'd be very very very secure! but if something hits the tool there's always the possibility it'd get lose, for that I can suggest you to add a mechanical switch to detect an attached tool and stop and warn you!
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Oh and don't be discouraged by others xD I had really no issues with mine. yes in theory a lot can go wrong but in practice it works very well for common use!
also if you want you can use the same motor for many tools but changing one of the couplings for a gear the extruder will go into or just using magnets to spin the other side (kinda hard tho. needs a special magnet too unless you make your own out of 2)
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@amythebun Oh yay, you're on the forum here!! Thanks so much for the inspiration! I saw your printer on Hackaday and thought it was super clever! I'm very excited to see if I can get it to work.
I got the prototype assembled and it looks like it it can take a load of about 750 g at the farthest corner before it torques out, so I figure if I set accelerations above about 9000 mm/s^2 I should be able to send it flying!
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on my side i will do the same system as the Paw printer because i really like it
https://www.youtube.com/watch?v=0ARCip5CrUk&feature=emb_title
https://forum.duet3d.com/topic/9392/latching-magnetic-tool-changer/31 -
@amythebun really clever about the tool engaged switch. thanks for the idea.
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@amythebun said in Critique my BLV cube toolchanger draft!:
also if you want you can use the same motor for many tools but changing one of the couplings for a gear the extruder will go into
I just read this line and was wondering, why no one responded to it? it's pretty clever IMHO.
The downside is, you have to align both sides of the clutch eventually.
Maybe this can be done with the magic stall detection feature? While moving the motor to the extruder, you spin it with low current. When it stalls, the connection is OK. A manual switch might work too, but is lame
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@o_lampe Wow yeah a good use for stall detection on the E motor! Very interesting.
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@psychotik2k3 Yeah that is so awesome! If mine doesn't work out I might try to do that as well.
I'm finally back in town so hope to get back to it soon. -
@whopping-pochard hi! is it ok i fi ask you if you ever went troug with this? i randomly came across this
I also now have a second tool changer, with a motor, that one is also very cheap to build
