How does one set this?
Searching I’m not finding anything on it….
I’ve attached an extruder (Wade’s Reloaded w/ J-Head Mk V-BV 1.75mm hotend) and have things pretty much working except it seems that the gantry settles down as it prints and starts rubbing against the bed.
Does one just set $7=255 as in Grbl? What relation does the Smoothie firmware have to Grbl? How much is in common / the same and what’s different?
Imported from wikidot
Hi !
Smoothie configuration has nothing in common with GRBL.
What does the setting you are looking for actually do, and what exactly is the problem you are running into ?
Cheers !
Step idle delay sets the number of microseconds which power is held on a motor after it moves into a position.
If set to 255, then motor power stays on constantly.
As I noted, I believe my machine is losing Z-axis position as it prints —- which is weird, 'cause I could’ve sworn that it used to hold power on the motors….
Smoothie -always- holds power to the motors until you say it to stop with a specific gcode.
Maybe you have a current setting problem ? What are your steppers rated for ( current ) and how are your settings/how are they wired ?
Motors are 1.68A, 200 step, 62 Oz-in NEMA 17s (stock for the Shapeoko full kit). I have Y-axis set to 2.0A (since that’s the max) and I think X- and Y- are set to 1.68A, Extruder is a smaller one, 0.33A
They’re wired into a 5.0A 24V power supply (the 3.75A unit for the Shapeoko isn’t up to powering the motors and the hot-end) - what’s the expected current draw for a J-Head Mk V-BV? (How do I tell if I have a Power Resistor, 5.6 ohm or 6.8 ohm?) - can I fix this by adjusting the power supply? If not, what’s the most affordable option for a new power supply?
Ok, 1.68A @ 24V, a bit of noise and lots of heat is not surprising, that’s normal.
5A PSU seems way too low for a 3D printer with the configuration you describe, I’d recommend at least 10A to be safe in your setup.
I’m actually surprised the shapeoko provides only a 3.75A PSU.
Can you try reducing current by 25% on all your steppers and see if that helps ?
Yeah, I was surprised about the 3.75A power supply as well. Updated the wiki to reflect that, so hopefully no one else will be taken by surprise.
I’ll try reducing the current (would reducing the temperature on the hotend reduce current draw as well?), and if that doesn’t help, will source a 10A power supply.
Thanks!
Thanks!
Tweaking the power supply settings seems to have things working.
Now I just need to commission / calibrate the machine and work up a part which is small enough to print before bedtime.
Worked up a config file: http://www.shapeoko.com/wiki/index.php/File:Config_azteegx5_shapeoko.txt
Please check / review and see if the numbers are reasonable. The configuration is intended to match: http://www.shapeoko.com/wiki/index.php/RepStrapOko