MK2-250 - Revision history

Davo at 14:03, 8 December 2025

2025-12-08T14:03:30Z

2025-12-08T14:03:11Z

2025-12-08T14:02:51Z

2021-10-19T15:42:40Z

2021-03-15T14:17:30Z

‎Description

2020-06-22T19:56:23Z

‎Firmware

2020-06-19T17:32:04Z

‎Changing Nozzles

2020-06-19T17:31:52Z

‎Changing Nozzles

2020-06-19T17:31:35Z

‎Maintenance

2018-02-25T16:06:22Z

@@ Line 5: / Line 5: @@
 |}
-<span style="color: red;">'''The MK2-250 has been discontinued, and replaced with the FH2-260.'''</span> It was specially designed for flexible filaments, and works with flexible 1.75mm filaments which print at temperatures up to 250°C.
+<span style="color: red;">'''The MK2-250 has been discontinued, and replaced with the FH2-260.'''</span>
 [[File:MK2-250.png|300px|left|MK2-250]]

@@ Line 5: / Line 5: @@
 |}
-<span style="color: red;">'''The MK2-250 has been discontinued, and replaced with the FH20269.'''</span> It was specially designed for flexible filaments, and works with flexible 1.75mm filaments which print at temperatures up to 250°C.
+<span style="color: red;">'''The MK2-250 has been discontinued, and replaced with the FH2-260.'''</span> It was specially designed for flexible filaments, and works with flexible 1.75mm filaments which print at temperatures up to 250°C.
 [[File:MK2-250.png|300px|left|MK2-250]]

@@ Line 5: / Line 5: @@
 |}
-The MK2-250 is specially designed for flexible filaments, and works with flexible 1.75mm filaments which print at temperatures up to 250°C.
+<span style="color: red;">'''The MK2-250 has been discontinued, and replaced with the FH20269.'''</span> It was specially designed for flexible filaments, and works with flexible 1.75mm filaments which print at temperatures up to 250°C.
 [[File:MK2-250.png|300px|left|MK2-250]]

@@ Line 18: / Line 18: @@
 *EcoFlex PLA
 *PlastInk_Rubber
 </div>

@@ Line 36: / Line 36: @@
 # Below the fitting, filament is routed into a PTFE guide tube, which leads the filament between two counter-rotating motor shafts, precisely spaced for flexible 1.75mm filament, giving precise positioning, advance and retract control; the guide tube continues to the top of the brass nozzle, and mates to it.
 # 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.
 == Loading the Head onto the Printer ==

@@ Line 75: / Line 75: @@
 == Firmware ==
-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).
+With version 4 and later, all heads take the same firmware!
 == Maintenance ==

← Older revision		Revision as of 17:32, 19 June 2020
Line 99:		Line 99:
	# 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.'''

← Older revision		Revision as of 17:31, 19 June 2020
Line 99:		Line 99:
	# 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.'''

← Older revision		Revision as of 17:31, 19 June 2020
Line 80:		Line 80:

	Very little maintenance is required on this head. Use a wire brush or tweezers to remove any excess plastic on the nozzle. Flexible filaments do not erode as easily as more rigid filaments.		Very little maintenance is required on this head. Use a wire brush or tweezers to remove any excess plastic on the nozzle. Flexible filaments do not erode as easily as more rigid filaments.
		+
		+	=== 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.

@@ Line 62: / Line 62: @@
 # 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, into the PTFE guide tube, until it comes in contact with the motor shafts.
 # Press the manual feed lever to the right, advancing the filament two to three cm.
-# 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.