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Retractable purge mechanism
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Topic starter
18/03/2021 9:11 am
Hi Folks,
I have an MK3S with a E3D hardened steel nozzle.
It seems my Nozzle is a few mm too low and blocking the retraction mechanism.
You can see from this photo the crease in the foil - this is the ridge that is catching on the nozzle:
https://photos.app.goo.gl/Wi529JYmRzjPJXmA8
Here is a video of a manual x axis jog. You can see the pinda catching, the assertion/retraction arm getting nudged by it downward then the nozzle catches and eventually pushes against the mechanisms assertion from the other direction.
https://photos.app.goo.gl/QRnpwmwYXv4xpPWXA
Tried both 2 and 3 springs, on single spring during the video. Pushing the retraction mech as the extruder body would manually - seems healthy.
It might be worth noting that the force of nozzle catching and the extruder body push simultaneously, sometimes causes the flicker's linkage to invert. This is the case in the photo and is fixed manually.
19/03/2021 3:50 pm
Hi @luke-mcneice,
the issue that must be resolved, for the RPM to work correctly, is that the nozzle must not contact any of the mechanism, so that the action is completely smooth. I'm not surprised that adjusting the number of springs didn't help. The RPM was designed to work with the standard nozzle. There are many different adapters available but they most relate to different printers frame mounting requirements. There are an infinite amount of variations of printers, when considering after market upgrades like extruders, nozzles, and hotends.
The easiest solution would be to temporarily switch nozzles back to the standard one for MultiColored 3D prints, since those are usually not done with abrasive materials. Otherwise, do you have any design ability (like with fusion360)? We do provide the design files so that customers can make changes to fit their unique setups.
Topic starter
19/03/2021 4:04 pm
@bigbrain3d Great - understood - just some confidence that moving the adapter is unlikely to cause other issues and the stl is enough.
Thanks!
20/03/2021 10:52 pm
correct. The blob needs to form below the washer. As long as the blob doesn't touch the washer you should be good to make changes.
Topic starter
04/05/2021 9:17 am
For anyone finding this: I ended up making a captive nut version with the modification I need. It's not parametric but it's fairly easy to edit if you need height changes: