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Printrbot Talk Forum • View topic - Marlin 1.1.9 and Endstop noise filter

Marlin 1.1.9 and Endstop noise filter

Need help troubleshooting hardware issues... talk here

Marlin 1.1.9 and Endstop noise filter

Postby coastline » 2019-Dec-Tue-05-Dec

I have a PB SM with a Rev D printrboard and E3d V6 Hotend.

I am upgrading to Marlin 1.1.9 which has been an interesting experience.

Marlin 1.1.9 has software noise filter off by default which causes my Y homing to throw kill errors. I can of course switch it back on and this prevents the errors but I'd like to try the hardware fix suggested in the Marlin Docs of adding a 100nf cap to the endstop switch.

Before I dismantle everything to get at the endstops I would like to try it out to see if it solves the problem and thought of putting the caps in at the connector end as in the picture below as it's easier to get to:

PBSM_endstop_cap.jpg

(I know that is the X endstop it's just to show what I'm thinking of doing).

So a few questions:

1. Does the postion of the Cap (ie at the switch or at the connector) make a difference?
2. Can I/should I add a Cap for the Z probe?
3. If I do add a Cap for the Z probe do I need a different Cap?
4. I have a Rev F4 printrboard which I never got around to installing. Does this have any advantages in this area (ie endstop caps on the board)?
5. Any Gotchas with regard to installing a Rev F4 board other than stepper direction changes?

Thanks.
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Marlin 1.1.9 and Endstop noise filter

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Re: Marlin 1.1.9 and Endstop noise filter

Postby RetireeJay » 2019-Dec-Tue-09-Dec

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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3, upgraded to MK3S
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Re: Marlin 1.1.9 and Endstop noise filter

Postby coastline » 2019-Dec-Tue-09-Dec

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Re: Marlin 1.1.9 and Endstop noise filter

Postby Mooselake » 2019-Dec-Tue-12-Dec

are pretty common, although I have no idea of how hard these would be to attach to a SM. As an added benefit you get the LEDs, and we all know the more LEDs the better. I have a set for my small CNC machine (where they're a slight convenience, not a necessity like 3D printers) but haven't gotten around to installing them.

I think jamming caps into connectors is a pretty common hobbyist bodge, I've done it myself :)

Kirk
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KS Thingybot Delta Pro 10/31/16
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Re: Marlin 1.1.9 and Endstop noise filter

Postby RetireeJay » 2019-Dec-Tue-21-Dec

Ok, I yield. It might help you to read this article.
If you were experiencing noise and unexpected triggering when NOT at the Y stop position, that's a different issue, not switch bounce, and you need to check for defects in the circuit, either open or short circuit.
  • 0

Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3, upgraded to MK3S
User avatar
RetireeJay
My next printer is...
 
Posts: 5014
Joined: 2013-Jan-Wed-13-Jan
Location: Greenville, SC
Reputation: 498


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