How to configure hot end heating after auto leveling?
 
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mitraton
(@mitraton)
New Member
How to configure hot end heating after auto leveling?

Hello,

I have a Two Trees Sapphire Plus with automatic leveling and I am having a problem. The code has sent the heating order just before leveling, which causes the printer to deposit small drops of material on the table.

I looked for some place to configure the nozzle heating to be carried out only after the automatic leveling but I didn't find it?
Could someone give me a tip on how to do this?

Thank you for your help,

Andson Gomes

Best Answer by Neophyl:

Some use a 2 stage warmup with our prusa machines.  That uses 

something like the following

M140 S[first_layer_bed_temperature] ; set bed temp
M104 S160 ; preheat extruder to no ooze temp to help warm PINDA
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S160 ; wait for extruder temp
M860 S36 ; wait for PINDA temp. 
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
Then a little later we have -
M104 S[first_layer_temperature] ; we heat extruder AFTER mesh to minimize ooze
M109 S[first_layer_temperature] ; wait for extruder temp

If your start gcode doesnt have any temp settings in it then slicer will automatically add them.  By adding them yourself it doesnt so you can control where they get placed. So you could have -

G28 W ; home all without mesh bed level
G80 ; mesh bed levelling <if your printer uses a different code to command levelling then replace as needed
M104 S[first_layer_temperature] ; we heat extruder AFTER mesh to minimize ooze, these placeholders loads the values set in the filaments profile
M109 S[first_layer_temperature] ; wait for extruder temp

Which would heat up everything after levelling.  Personally I wouldnt as heating the bed can effect its level so I would do the 2 stage warmup where the bed is heated (and nozzle if you want to speed up print start after levelling) to a no ooze temp around 160-170 degrees.  Then level, then heat to printing temp using the above placeholders.  Followed by whatever prime line you normally use (if you use one).

Posted : 23/03/2021 11:34 am
Neophyl
(@neophyl)
Famed Member
RE: How to configure hot end heating after auto leveling?

Some use a 2 stage warmup with our prusa machines.  That uses 

something like the following

M140 S[first_layer_bed_temperature] ; set bed temp
M104 S160 ; preheat extruder to no ooze temp to help warm PINDA
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S160 ; wait for extruder temp
M860 S36 ; wait for PINDA temp. 
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
Then a little later we have -
M104 S[first_layer_temperature] ; we heat extruder AFTER mesh to minimize ooze
M109 S[first_layer_temperature] ; wait for extruder temp

If your start gcode doesnt have any temp settings in it then slicer will automatically add them.  By adding them yourself it doesnt so you can control where they get placed. So you could have -

G28 W ; home all without mesh bed level
G80 ; mesh bed levelling <if your printer uses a different code to command levelling then replace as needed
M104 S[first_layer_temperature] ; we heat extruder AFTER mesh to minimize ooze, these placeholders loads the values set in the filaments profile
M109 S[first_layer_temperature] ; wait for extruder temp

Which would heat up everything after levelling.  Personally I wouldnt as heating the bed can effect its level so I would do the 2 stage warmup where the bed is heated (and nozzle if you want to speed up print start after levelling) to a no ooze temp around 160-170 degrees.  Then level, then heat to printing temp using the above placeholders.  Followed by whatever prime line you normally use (if you use one).

Posted : 23/03/2021 1:09 pm
mitraton liked
bobstro
(@bobstro)
Illustrious Member
RE: How to configure hot end heating after auto leveling?

I've got notes on a 2-stage nozzle warmup procedure here.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 23/03/2021 1:13 pm
mitraton liked
mitraton
(@mitraton)
New Member
Topic starter answered:
RE: How to configure hot end heating after auto leveling?

Thank you for the solution.

Posted : 24/03/2021 2:03 am
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