MK1-250 - Revision history

Davo: /* Description */

2021-03-15T14:17:12Z

Description

← Older revision		Revision as of 14:17, 15 March 2021
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	# Beneath this, the filament enters into a 2mm ID PTFE guide tube, which leads the filament to the brass nozzle, with which the PTFE tubing mates.		# Beneath this, the filament enters into a 2mm ID PTFE guide tube, which leads the filament to the brass nozzle, with which the PTFE tubing mates.
	# At the nozzle, heat is transferred to the filament, whereupon it is forced out through the brass nozzle. Nozzles are available in 1.0mm, 0.75mm, 0.50mm and 0.35mm sizes, as well as blanks, which you can open up to your own custom diameter.		# At the nozzle, heat is transferred to the filament, whereupon it is forced out through the brass nozzle. Nozzles are available in 1.0mm, 0.75mm, 0.50mm and 0.35mm sizes, as well as blanks, which you can open up to your own custom diameter.
			# MK1-250 heads take Hyrel proprietary nozzles; standard nozzles may work for a short time, but will eventually cause problems.

	== Loading the Head onto the Printer ==		== Loading the Head onto the Printer ==

Davo: /* Firmware */

2020-06-22T19:56:47Z

Firmware

← Older revision		Revision as of 19:56, 22 June 2020
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	== Firmware ==		== Firmware ==

	~~MK1-250~~ heads ~~from the 2015 onward should have platinum RTD wires, and therefore use~~ the firmware ~~labeled "FILAMENTS_33A.hex" or "hothead.mk400.33A.hex" (these are actually the same file with different names).~~		With version 4 and later, all heads take the same firmware!

	~~MK1~~-250 heads ~~from 2014 and earlier should have red RTD wires, and therefore~~ use the firmware labeled "~~OLD_NOJUMPERS_232A~~.hex" or "~~hothead_232A~~.hex" (these are ~~also~~ the same file with different names).		With version 3 and earlier, MK2-250 heads all use the firmware labeled "FILAMENTS_33A.hex" or "hothead.mk400.33A.hex" (these are actually the same file with different names).

	~~Very old MK1-250 heads may have a wire jumper (usually red or yellow), as shown. These boards use the firmware labeled "OLD_JUMPERS_232J.hex" or "hothead_jmpr_232J.hex"~~.

	== Maintenance ==		== Maintenance ==

Davo: /* Changing Nozzles */

2020-06-19T17:32:23Z

Changing Nozzles

← Older revision		Revision as of 17:32, 19 June 2020
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	# Use normal procedure for heating and loading filament.		# Use normal procedure for heating and loading filament.

	Please let me know if any of that is not clear. You really should not have to do this. If you replace our nozzle with some other nozzle, you may have issues, because ours is designed to mate with the guide tubing with no gap.		Please let me know if any of that is not clear.

			'''You really should not have to do this. If you replace our nozzle with some other nozzle, you may have issues, because ours is designed to mate with the guide tubing with no gap.'''

Davo: /* Maintenance */

2020-06-19T17:31:15Z

Maintenance

← Older revision		Revision as of 17:31, 19 June 2020
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	Very little maintenance is required on this head. Use a wire brush or tweezers to remove any excess plastic on the nozzle, and use a shop vac or air hose to suck or blow away any buildup of eroded filament in the feed chamber and/or on the hobs (teeth) of the motor shaft.		Very little maintenance is required on this head. Use a wire brush or tweezers to remove any excess plastic on the nozzle, and use a shop vac or air hose to suck or blow away any buildup of eroded filament in the feed chamber and/or on the hobs (teeth) of the motor shaft.

			=== Changing Nozzles ===

			How to disassemble the nozzle from the MK1 head:

			# Carefully:
			# Heat to the printing temperature of the material loaded.
			# Move the manual lever to the left, retracting material until it is free of the hobbed shaft, then remove by hand.
			# Turn off heat to the head and remove it from the yoke.
			# With a 1/4" driver or wrench, remove the nozzle.
			#. Inspect the nozzle cavity for any stray material; if found, remove with tweezers, solvent, air pressure or other means.

			How to reassemble the nozzle on an MK1 head:

			# Carefully:
			# Ensure your MK1 has no filament loaded.
			# With a 1/4" driver or wrench, attach the nozzle.
			# Use normal procedure for heating and loading filament.

			Please let me know if any of that is not clear. You really should not have to do this. If you replace our nozzle with some other nozzle, you may have issues, because ours is designed to mate with the guide tubing with no gap.

Davo at 16:06, 25 February 2018

2018-02-25T16:06:32Z

← Older revision		Revision as of 16:06, 25 February 2018
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	# Straighten (if needed) the last few cm of the new filament, which should be routed through the guide tubing. Insert it down through the pneumatic fitting on the top and centered between the two bearings, between the bearings and the drive shaft of the motor.		# Straighten (if needed) the last few cm of the new filament, which should be routed through the guide tubing. Insert it down through the pneumatic fitting on the top and centered between the two bearings, between the bearings and the drive shaft of the motor.
	# Press the manual feed lever to the right, advancing the filament until the lead end advances into the white PTFE tube.		# Press the manual feed lever to the right, advancing the filament until the lead end advances into the white PTFE tube.
	# In repetrel, click the motor on at 500 (pulses per ~~minute~~) until the new filament advances to the melting zone and forces the old filament out. Advance about 30cm of filament, checking for smooth sides and uniform color.		# In repetrel, click the motor on at 500 (pulses per second) until the new filament advances to the melting zone and forces the old filament out. Advance about 30cm of filament, checking for smooth sides and uniform color.
	# Remove excess filament with tweezers. Seat the guide tubing. You are ready to go.		# Remove excess filament with tweezers. Seat the guide tubing. You are ready to go.

Davo at 19:38, 11 May 2017

2017-05-11T19:38:36Z

← Older revision		Revision as of 19:38, 11 May 2017
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	The MK1-250 is our primary workhorse print head, and works for standard (rigid) 1.75mm filaments which print at temperatures up to 250°C.		The MK1-250 is our primary workhorse print head, and works for standard (rigid) 1.75mm filaments which print at temperatures up to 250°C.

	[[File:MK1-250.png\|~~200px~~\|left\|MK1-250]]		[[File:MK1-250.png\|300px\|left\|MK1-250]]

	This includes the following materials:		This includes the following materials:

Davo at 15:03, 1 April 2017

2017-04-01T15:03:38Z

← Older revision		Revision as of 15:03, 1 April 2017
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	*T-Glase		*T-Glase
	</div>		</div>

			== Videos ==

	# '''General MK Series Videos:'''		# '''General MK Series Videos:'''

Davo at 15:02, 1 April 2017

2017-04-01T15:02:27Z

← Older revision		Revision as of 15:02, 1 April 2017
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	The MK1-250 is our primary workhorse print head, and works for standard (rigid) 1.75mm filaments which print at temperatures up to 250°C.		The MK1-250 is our primary workhorse print head, and works for standard (rigid) 1.75mm filaments which print at temperatures up to 250°C.

	* [[File:Yt.png]] [https://www.youtube.com/watch?v=yaCYFmoIESk Video: Overview of the MK1-250 Print Head]

	[[File:MK1-250.png\|200px\|left\|MK1-250]]		[[File:MK1-250.png\|200px\|left\|MK1-250]]
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	*T-Glase		*T-Glase
	</div>		</div>

			# '''General MK Series Videos:'''
			## [[File:Yt.png]] [https://www.youtube.com/watch?v=Fg9omXlYR-Q MK Series Printing Tips]
			## [[File:Yt.png]] [https://www.youtube.com/watch?v=0Aj9WCabPgw Post Processing with a Heat Gun]
			## [[File:Yt.png]] [https://www.youtube.com/watch?v=Llas80vYFPc Loading and Unloading Filament in the MK Series head]
			# '''MK1-250''' Extruder for Standard Filament Videos:
			## [[File:Yt.png]] [https://www.youtube.com/watch?v=yaCYFmoIESk Overview]
			## [[File:Yt.png]] [https://www.youtube.com/watch?v=v2ifSlZ0qEw Loading and Printing]

	== Description ==		== Description ==

Davo at 19:35, 28 November 2016

2016-11-28T19:35:58Z

← Older revision		Revision as of 19:35, 28 November 2016
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	* [[File:Yt.png]] [https://www.youtube.com/watch?v=yaCYFmoIESk Video: Overview of the MK1-250 Print Head]		* [[File:Yt.png]] [https://www.youtube.com/watch?v=yaCYFmoIESk Video: Overview of the MK1-250 Print Head]

	[[File:MK1-250.png\|MK1-250]]		[[File:MK1-250.png\|200px\|left\|MK1-250]]

	This includes the following materials:		This includes the following materials:

	<div style="column-count:5;-moz-column-count:5;-webkit-column-count:5">		<div style="column-count:3;-moz-column-count:3;-webkit-column-count:3">
	*ABS (Acrylonitrile Butadiene Styrene)		*ABS (Acrylonitrile Butadiene Styrene)
	**Flame Retardant ABS		**Flame Retardant ABS

Davo at 19:29, 28 November 2016

2016-11-28T19:29:58Z

← Older revision		Revision as of 19:29, 28 November 2016
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	The MK1-250 is our primary workhorse print head, and works for standard (rigid) 1.75mm filaments which print at temperatures up to 250°C.		The MK1-250 is our primary workhorse print head, and works for standard (rigid) 1.75mm filaments which print at temperatures up to 250°C.

			* [[File:Yt.png]] [https://www.youtube.com/watch?v=yaCYFmoIESk Video: Overview of the MK1-250 Print Head]

	[[File:MK1-250.png\|MK1-250]]		[[File:MK1-250.png\|MK1-250]]