Smart Effector - Direct Drive / XL Edition
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Apart from the built-in accelerometer from the other suggestion I would also love a smarteffector version with
- bigger rod spacing (~80mm?)
- better stiffness (3mm PCB?)
- (additional) mountpoints for Dragon/Mosquito/..hotends
Right now it's an absolute pain to fit any of the small direct drive extruders (Orbiter, Sherpa Mini, HevoRT,..) as it requires a pretty substantial dostance piece and tilt. Apart from that they're also seriously prone to tilt the hotend due to the added weight on top (you can easily see the SE board bend and the hotend tilt when applying light pressure with the pinky finger on the extruder).
I do think that there's a place for a Smart Effector XL version nowadays alongside the classic 55mm form factor.
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@bberger
The strain gauge z-probe of the SE requires the PCB to be reasonable flexible and thin. A bigger rod distance could be achieved by a CNC'd frame that holds the PCB.
Or maybe we see one of these inline strain gauge heatsinks , like Prusas on a SE2.0? -
@o_lampe not everybody has access to a CNC mill or the space to set one up, hence the suggestion. 3D printed adapters surely would be a route one could go for - but then again you need the material for it and a machine you trust for accuracy in the first place. It also would split the community in making designs for cooling solutions etc.
But after thinking about your comment - maybe it would even be enough if there were an easy/accessible to fabricate (lasercut sheet metal or printed) "reference" adapter design.
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@bberger I get your point about 3d printed parts, but the magballs are threaded and would have clearance holes on the SE, or the adapter you make, so the total tolerance on their positions would be largely controlled by that, not your current 3D printers accuracy (assuming it is of reasonable quality). There's little point drilling a hole with a 10um position tolerance if the hole will be 200um oversize!
I have seen a few SE adapters around here and on thingiverse which people have been working on aimed at the sherpa and orbiter extruders. Also, I believe a larger variant may be planned / under development with toolboard capabilities (though not seen any confirmations as to when this might appear etc)
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Pardon me for butting in, however, I solved that problem with my BMG BondTech direct drive extruder on my AnyPubic delta, by designing and printing a nifty problem solving flying-extruder platform supported by soft surgical tubing. I looked each of the direct-drive extruders you cited, I speculate that they are all roughly the same size and weight of of my BMG BondTech. There is no tilt or weight added to my Smart-Effector. I am very happy with the arrangement I fabricated. Not what you'd like to see, but it is certainly a doable work-around.
Eventually I'll get off my lazy butt to upload the details along with oScad design files so others can hack it up as they choose.
3mm
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@3mm the BMG with a pancake nema 17 (in my case a Moon's) weighted in about 290g (75g for the BMG, ~200g for the motor, plus bowden coupler, silicon hose, bowden tube, ..).
The orbiter is 135g, so less than half the weight. It however isn't the weight on the flying extruder I'm concerned about, it's the yanking of the bowden tube (in my case was ~150mm) on my 380mm bed delta that I suspect is the source for artifacts I saw.
I can run 5k acc/600jerk/no input shaping/100mms-150mms, 0.015 PA, 0.6mm retractions with the direct mounted (on a 7cm tall, petg printed stand and tilted) Orbiter V2 with almost none / negligible artifacts.
I wasn't able to do that with my flying BMG.. had to run 3k/300jerk/~70mm/0.4 PA/1.5mm retractions for worse quality than on the current direct drive solution.