Flow Rate - Revision history

Davo: /* Overview */

2021-02-15T14:18:29Z

Overview

← Older revision		Revision as of 14:18, 15 February 2021
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	<span style="color:purple">'''3. Print Speed''', as specified '''in your gcode by a G1 command with an F (feed rate) value''' (which should be set by your slicer, but may be edited afterward);</span><br><br>		<span style="color:purple">'''3. Print Speed''', as specified '''in your gcode by a G1 command with an F (feed rate) value''' (which should be set by your slicer, but may be edited afterward);</span><br><br>
	- '''<span style="color:red">1</span> x <span style="color:blue">2</span> x <span style="color:purple">3</span>''' - cross section times linear speed gives us '''volume per unit time (in nl/sec)''' to be dispensed.<br><br>		- '''<span style="color:red">1</span> x <span style="color:blue">2</span> x <span style="color:purple">3</span>''' - cross section times linear speed gives us '''volume per unit time (in nl/sec)''' to be dispensed.<br><br>
	<span style="color:darkorange">'''4. Pulses per ~~Nanoliter~~''' (~~actually~~, pulses for 10 nanoliters), as specified '''on the data for that print head''' (NOT path width in the slicer) [unless you manually hard code a value in your gcode];</span><br><br>		<span style="color:darkorange">'''4. Pulses per Microliter''' (on v3, this was pulses for 10 nanoliters), as specified '''on the data for that print head''' (NOT path width in the slicer) [unless you manually hard code a value in your gcode];</span><br><br>
	- '''<span style="color:red">1</span> x <span style="color:blue">2</span> x <span style="color:purple">3</span> x <span style="color:darkorange">4</span>''' - volume per unit time times pulses per unit volume gives us how fast in '''pulses per second''' to dispense.<br><br>		- '''<span style="color:red">1</span> x <span style="color:blue">2</span> x <span style="color:purple">3</span> x <span style="color:darkorange">4</span>''' - volume per unit time times pulses per unit volume gives us how fast in '''pulses per second''' to dispense.<br><br>
	<span style="color:magenta">'''5. Material Flow Rate Multiplier''', as specified '''on the data for that print head''' (NOT path width in the slicer) [unless you manually hard code a value in your gcode];</span><br><br>		<span style="color:magenta">'''5. Material Flow Rate Multiplier''', as specified '''on the data for that print head''' (NOT path width in the slicer) [unless you manually hard code a value in your gcode];</span><br><br>

Davo: /* M221 Note! */

2020-06-25T14:40:54Z

M221 Note!

← Older revision		Revision as of 14:40, 25 June 2020
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	== <span style="color: red;">M221 Note!</span> ==		== <span style="color: red;">M221 Note!</span> ==

	<span style="color: red;">This page describes our native Hyrel flow calculations. If you are using '''~~M221~~ E1 D1''' to opt in to using the E values produced by the slicer, IGNORE THIS PAGE.</span>		<span style="color: red;">This page describes our native Hyrel flow calculations. If you are using '''M229 E1 D1''' to opt in to using the E values produced by the slicer, IGNORE THIS PAGE.</span>

	== Overview ==		== Overview ==

Davo at 21:04, 16 March 2020

2020-03-16T21:04:34Z

← Older revision		Revision as of 21:04, 16 March 2020
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	\| __TOC__		\| __TOC__
	\|}		\|}

			== <span style="color: red;">M221 Note!</span> ==

			<span style="color: red;">This page describes our native Hyrel flow calculations. If you are using '''M221 E1 D1''' to opt in to using the E values produced by the slicer, IGNORE THIS PAGE.</span>

	== Overview ==		== Overview ==

Davo: /* Immediate Commands */

2019-12-04T12:44:20Z

Immediate Commands

← Older revision		Revision as of 12:44, 4 December 2019
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	While '''M721 S10000 E300 P105 T12''' will set up the prime ''values'' for the print head, it will not cause these values to be executed.		While '''M721 S10000 E300 P105 T12''' will set up the prime ''values'' for the print head, it will not cause these values to be executed.

	'''M721 I1''' will cause that print head last addressed (or '''M721 T12 I1''' if you want to specify) to perform the ~~prime~~ at this point in the code, with the values previously stored for that head.		'''M721 I1''' will cause that print head last addressed (or '''M721 T12 I1''' if you want to specify) to perform the unprime at this point in the code, with the values previously stored for that head.

	Likewise, '''M722 I1''' will cause the print head to do ~~an unprime~~.		Likewise, '''M722 I1''' will cause the print head to do a prime.

	== Initial Numbers ==		== Initial Numbers ==

Davo: /* Unprime */

2019-12-04T12:21:12Z

Unprime

← Older revision		Revision as of 12:21, 4 December 2019
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	Using the same logic as above, I'll dial in the proper number of pulses for the unprime - and this number should be the same for the prime, below.		Using the same logic as above, I'll dial in the proper number of pulses for the unprime - and this number should be the same for the prime, below.

	Since we always leave the prime/unprime rate at 10,000, next we'll dial in the dwell time. For filament heads this is usually between 20 and 35msec, but for reservoir prints, it's usually much larger. I like to use 1/10 of the number of pulses; so, if my unprime is 4000 pulses, I'll set the delay to 400msec.		Since we always leave the prime/unprime rate at 10,000, next we'll dial in the dwell time. For filament heads this is usually between 20 and 35msec, but for reservoir prints, it's usually much larger. I like to use 1/10 of the number of pulses; so, if my unprime is 4000 pulses, I'll set the delay to 400msec for reservoir heads.

	=== Prime ===		=== Prime ===

Davo: /* Unprime */

2019-12-04T12:20:40Z

Unprime

← Older revision		Revision as of 12:20, 4 December 2019
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	Using the same logic as above, I'll dial in the proper number of pulses for the unprime - and this number should be the same for the prime, below.		Using the same logic as above, I'll dial in the proper number of pulses for the unprime - and this number should be the same for the prime, below.

	Since we always leave the prime/unprime rate at 10,000, next we'll dial in the dwell time. For filament heads this is usually between 20 and 35msec, but for reservoir prints, it's usually much larger. I like to use ~~10x~~ the number of pulses; so, if my unprime is ~~400~~ pulses, I'll set the delay to ~~4000msec~~.		Since we always leave the prime/unprime rate at 10,000, next we'll dial in the dwell time. For filament heads this is usually between 20 and 35msec, but for reservoir prints, it's usually much larger. I like to use 1/10 of the number of pulses; so, if my unprime is 4000 pulses, I'll set the delay to 400msec.

	=== Prime ===		=== Prime ===

Davo: /* Prime */

2019-12-03T19:03:06Z

Prime

← Older revision		Revision as of 19:03, 3 December 2019
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	** '''P20''' (20ms before start of print move sequence)		** '''P20''' (20ms before start of print move sequence)
	** '''T11''' (for far left head)		** '''T11''' (for far left head)

			Next, I'll set the primes to the same values as the unprimes (except for positive dwell time, unlike the negative dwell for unprimes). If that works, great! If not, we'll need to tune it up...

			We'll use the same gcode for the primes, but we'll set the prime values instead:

			T1
			G0 X50 Y50
			M7212 T12 E100 ; prime 100 pulses
			G1 X150 Y50 E1 F2000
			M722 T12 E120 ; prime 120 pulses
			G1 X150 Y60
			G1 X50 Y60 E1
			M722 T12 E140 ; prime 140 pulses
			G1 X50 Y70
			G1 X150 Y70 E1
			M722 T12 E160 ; prime 160 pulses
			G1 X150 Y80
			G1 X50 Y80 E1
			M722 T12 E180 ; prime 180 pulses
			G1 X50 Y90
			G1 X150 Y90 E1

			Next, using the same logic and methodology as before, we'll adjust, print, and observe until we get these final numbers set to our satisfaction.

Davo: /* Prime */

2019-12-03T19:00:13Z

Prime

← Older revision		Revision as of 19:00, 3 December 2019
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	=== Prime ===		=== Prime ===

	Lastly, we dial in the Prime. M722 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M722_Set_Prime_Values		Lastly, we dial in the Prime. M722 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M722_Set_Prime_Values but I'll reproduce it here:

			'''M722 sends information to the printer about how much material to prime when a transition from non-printing move to printing move is detected:'''

			* S is the speed at which prime moves should be executed; this is normally 10,000;
			* E is the number of pulses on the feed (extrusion) motor to execute; this varies greatly among materials;
			* P is the number of milliseconds to pause before enabling the flow rate for the following move;
			* T is the tool (head) to which these values will be applied; and
			* I is the flag for executing an Immediate action; so M721 I1 would execute a prime with the previously specified values at that point in the gcode.

			Here is an example:

			M722 S10000 E100 P20 T11

			These commands are decoded and executed by the printer as follows:

			* '''M722''' (Set Prime Values)
			** '''S10000''' (10,000 pps)
			** '''E100''' (100 pulses)
			** '''P20''' (20ms before start of print move sequence)
			** '''T11''' (for far left head)

Davo: /* Unprime */

2019-12-03T18:59:40Z

Unprime

← Older revision		Revision as of 18:59, 3 December 2019
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	=== Unprime ===		=== Unprime ===

	Now we need to dial in the Unprime. M721 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M721_Set_Unprime_Values -		Now we need to dial in the Unprime. M721 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M721_Set_Unprime_Values but I will reproduce it here:

			'''M721 sends information to the printer about how much material to unprime when a transition from printing move to non-printing move is detected:'''

			* S is the speed at which unprime moves should be executed; this is normally 10,000;
			* E is the number of pulses on the feed (extrusion) motor to execute; this varies greatly among materials;
			* P is the number of milliseconds to pause before enabling the flow rate for the following move;
			* T is the tool (head) to which these values will be applied; and
			* I is the flag for executing an Immediate action; so M721 I1 would execute an unprime with the previously specified values at that point in the gcode.

			Here is an example:

			M721 S10000 E100 P-15 T11

			These commands are decoded and executed by the printer as follows:

			* '''M721''' (Set Unprime Values)
			** '''S10000''' (10,000 pps)
			** '''E100''' (100 pulses)
			** '''P-15''' (15ms before end of print move sequence)


	I normally take the same digital snake from above, but I make the short moves non-printing by removing the E1:		I normally take the same digital snake from above, but I make the short moves non-printing by removing the E1:
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	G0 X50 Y50		G0 X50 Y50
	G1 X150 Y50 E1 F2000		G1 X150 Y50 E1 F2000
	G1 X150 Y60 E1		G1 X150 Y60
	G1 X50 Y60 E1		G1 X50 Y60 E1
	G1 X50 Y70 E1		G1 X50 Y70
	G1 X150 Y70 E1		G1 X150 Y70 E1
	G1 X150 Y80 E1		G1 X150 Y80
	G1 X50 Y80 E1		G1 X50 Y80 E1
	G1 X50 Y90 E1		G1 X50 Y90
	G1 X150 Y90 E1		G1 X150 Y90 E1

	If the unprimes are good, we're done. If not, I change the values for each printing move. I ~~usually use~~		If the unprimes are good, we're done. If not, I change the values for each printing move. For example, if the unprime pulese were 100, and this was not enough, I'll change ONLY the pulses:

	T1		T1
	G0 X50 Y50		G0 X50 Y50
	~~M722~~ T12		M721 T12 E100 ; unprime 100 pulses
	G1 X150 Y50 E1 F2000		G1 X150 Y50 E1 F2000
	G1 X150 Y60 E1		M721 T12 E120 ; unprime 120 pulses
			G1 X150 Y60
	G1 X50 Y60 E1		G1 X50 Y60 E1
	G1 X50 Y70 E1		M721 T12 E140 ; unprime 140 pulses
			G1 X50 Y70
	G1 X150 Y70 E1		G1 X150 Y70 E1
	G1 X150 Y80 E1		M721 T12 E160 ; unprime 160 pulses
			G1 X150 Y80
	G1 X50 Y80 E1		G1 X50 Y80 E1
	G1 X50 Y90 E1		M721 T12 E180 ; unprime 180 pulses
			G1 X50 Y90
	G1 X150 Y90 E1		G1 X150 Y90 E1

			Using the same logic as above, I'll dial in the proper number of pulses for the unprime - and this number should be the same for the prime, below.

			Since we always leave the prime/unprime rate at 10,000, next we'll dial in the dwell time. For filament heads this is usually between 20 and 35msec, but for reservoir prints, it's usually much larger. I like to use 10x the number of pulses; so, if my unprime is 400 pulses, I'll set the delay to 4000msec.

	=== Prime ===		=== Prime ===

	Lastly, we dial in the Prime. M722 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M722_Set_Prime_Values		Lastly, we dial in the Prime. M722 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M722_Set_Prime_Values

Davo: /* Initial Numbers */

2019-12-03T13:09:03Z

Initial Numbers

← Older revision		Revision as of 13:09, 3 December 2019
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	== Initial Numbers ==		== Initial Numbers ==

			So, sometimes people ask us where we get our numbers for pulses per microliter, and prime, and unprime.

			=== Flow ===

			First, we determine the flow. M221 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M221_Set_Flow_Rate but I will reproduce this here:

			'''M221 sends information to the printer about material flow:'''

			* P is the number of pulses on the motor to dispense 10 nl of material;
			* S is the direct flow multiplier (to allow for undersized or oversized stock;
			* W is the width of the cross section of the volume to fill;
			* Z is the height (layer thickness) of the cross section of the volume to fill; and
			* T is the tool (head) to which these values will be applied.

			Here is an example:

			M221 S1.0 T11 P77 W0.5 Z0.3

			These commands are decoded and executed by the printer as follows:

			* '''M221''' (Set Flow Rate)
			** '''S1.0''' (flow multiplier of 1.0)
			** '''T11''' (for far left head)
			** '''P77''' (77 pulses per microliter)
			** '''W0.5''' (0.5mm nozzle)
			** '''Z0.3''' (0.3mm layer thickness) - note that your gcode M756 will overwrite this value)


			This can be as simple as setting the Z-zero and printing a "digital snake" like this - a series of long lines at a constant speed (without headers and footers), using slot 2 (T1):

			T1
			G0 X50 Y50
			G1 X150 Y50 E1 F2000
			G1 X150 Y60 E1
			G1 X50 Y60 E1
			G1 X50 Y70 E1
			G1 X150 Y70 E1
			G1 X150 Y80 E1
			G1 X50 Y80 E1
			G1 X50 Y90 E1
			G1 X150 Y90 E1

			So, that's fine if everything's perfect. But let's say your pulses per microliter were set to 80, but you are not putting out enough material. We would change the flow parameters with each line, like this:

			T1
			G0 X50 Y50
			M221 T12 P81 ; 81 pulses
			G1 X150 Y50 E1 F2000
			G1 X150 Y60 E1
			M221 T12 P82 ; 82 pulses
			G1 X50 Y60 E1
			G1 X50 Y70 E1
			M221 T12 P83 ; 83 pulses
			G1 X150 Y70 E1
			G1 X150 Y80 E1
			M221 T12 P84 ; 84 pulses
			G1 X50 Y80 E1
			G1 X50 Y90 E1
			M221 T12 P85 ; 85 pulses
			G1 X150 Y90 E1

			Now, we'll inspect these lines, and let's say the lines printed with 83 pulses was very good, but we want it to be even better; we'd do this:

			T1
			G0 X50 Y50
			M221 T12 P82.4 ; 82.4 pulses
			G1 X150 Y50 E1 F2000
			G1 X150 Y60 E1
			M221 T12 P82.6 ; 82.6 pulses
			G1 X50 Y60 E1
			G1 X50 Y70 E1
			M221 T12 P82.8 ; 82.8 pulses
			G1 X150 Y70 E1
			G1 X150 Y80 E1
			M221 T12 P83 ; 83 pulses
			G1 X50 Y80 E1
			G1 X50 Y90 E1
			M221 T12 P83.2 ; 83.2 pulses
			G1 X150 Y90 E1

			Now, we inspect these again, and decide that 82.8 pulses is our number. Or, we can repeat this with smaller increments until we get the number that works best. Then we'll test it on actual prints.

			When we're happy with the flow number, we'll move on to the Unprime...

			=== Unprime ===

			Now we need to dial in the Unprime. M721 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M721_Set_Unprime_Values -

			I normally take the same digital snake from above, but I make the short moves non-printing by removing the E1:

			T1
			G0 X50 Y50
			G1 X150 Y50 E1 F2000
			G1 X150 Y60 E1
			G1 X50 Y60 E1
			G1 X50 Y70 E1
			G1 X150 Y70 E1
			G1 X150 Y80 E1
			G1 X50 Y80 E1
			G1 X50 Y90 E1
			G1 X150 Y90 E1

			If the unprimes are good, we're done. If not, I change the values for each printing move. I usually use

			T1
			G0 X50 Y50
			M722 T12
			G1 X150 Y50 E1 F2000
			G1 X150 Y60 E1
			G1 X50 Y60 E1
			G1 X50 Y70 E1
			G1 X150 Y70 E1
			G1 X150 Y80 E1
			G1 X50 Y80 E1
			G1 X50 Y90 E1
			G1 X150 Y90 E1



			=== Prime ===

			Lastly, we dial in the Prime. M722 is detailed at http://hyrel3d.net/wiki/index.php?title=Gcode#M722_Set_Prime_Values