Delta printer start of print extruder coming down too fast.

Doc

Start of print after homing the extruder head on my Delta is coming down way too fast at the start of the print. This printer purchased already assembled with a duet 2 ethernet. First time duet user.

I can read the config files on the web interface I'm just not sure which F speed I need to adjust , I thought it was the G1 command. Usually these settings are in the slicer but it just has the g28 homing command. Simplify 3D

Thanks !!

Phaedrux

To help us figure out what's happening please post the contents of your config.g, homedelta.g, bed.g and your slicer start gcode or the first 50 lines or so from a sliced gcode file. Also send M122 in the gcode console and post the response.

Veti

you can decrease the maximum global z speed in the M208 command

like
M203 X18000.00 Y18000.00 Z18000.00 E1200.00 ; set maximum speeds (mm/min)

Doc

This post is deleted!

Doc

Thx Guys I did find the global section but something in one of the configs is telling it to move at that speed start of the print.

These manufacturers like to show off so they put these super fast movements when its not needed.

M92 X160 Y160 Z160
M906 X1100 Y1100 Z1100 E1100 I40
M201 X4000 Y4000 Z4000 E4000
M204 P1000 T4000
M203 X18000 Y18000 Z18000 E18000
M566 X1000 Y1000 Z1000 E1200
M665 L400.290 R228.5 H410 B130 X0 Y0 Z0

o_lampe

@doc
I wouldn't reduce z-max speed too much, it gets useful when you use Zhop in retraction moves. (and thereby allow for safer travel moves at 300mm/s and more)
What you really need is gain confidence in your printers capabilities.

dc42

@o_lampe said in Delta printer start of print extruder coming down too fast.:

@doc
I wouldn't reduce z-max speed too much, it gets useful when you use Zhop in retraction moves. (and thereby allow for safer travel moves at 300mm/s and more)
What you really need is gain confidence in your printers capabilities.

Z max speed is unlikely to affect the Z hop speed, because the hop is too short to allow it to get anywhere near to Z max speed. OTOH if you reduce max Z acceleration, that will impact the Z hop speed.

alankilian

I think the question is:

"How does the Duet determine how fast to make a G1 move (with no f parameter) immediately after a G28?"

If my last G1 move in homedelta.g has an F300 and I home and then if I enter into the GCODE console a G1 x0 y0 z100 it moves WAY WAY faster than 300.

I suspect the "stack" gets pushed before G28 and then gets "popped" after and some unknown speed is activated.

o_lampe

@alankilian @Doc
If you really want to slow down the first move, just reduce X,Y,Z max-speed in homedelta.g (or bed.g after probing)
Later (in slicer start-gcode) you can allow faster moves

Doc

THANKYOU for your responses I will try your suggestions