Filament Heads

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Filament is our term for filament-based materials which are deposited at over 150°C, depending on the head.

Note that at present, our Filament heads work with 1.75mm filament (actually, 1.6mm to 1.9mm), but not 3mm filament.

Materials for Filament Heads

The following materials can be printed from Filament heads.

  • ABS (Acrylonitrile Butadiene Styrene)
    • Flame Retardant ABS
    • ABS - PC Alloy
    • Conductive ABS
    • Smart ABS
  • BendLay
  • Flex 45
  • HIPS (High-Impact PolyStyrene)
  • LayBrick
  • LayWoo-d3
  • MoldLay
  • Ninjaflex
  • Nylon
    • Taulman 618, 645, 910
  • PC (PolyCarbnoate)
  • PEI (PolyEtherImide) - AKA Ultem
  • PEEK (PolyEther Ether Ketone)
  • PET (PolyEthylene Terephthalate)
  • PETG PolyEthylene Terephthalate Glycol-modified)
  • PLA (PolyLactic Acid)
    • EcoFlex PLA
    • Conductive PLA
    • SS PLA (Stainless Steel infused)
  • PlastInk_Rubber
  • PP (PolyPropylene)
  • PVA (PolyVinyl Alcohol)
  • T-Glase
  • Ultem

Filament Heads

Filament-based printing is available through the following heads:

  1. General MK Series Videos:
    1. Yt.png MK Series Printing Tips
    2. Yt.png Post Processing with a Heat Gun
    3. Yt.png Loading and Unloading Filament in the MK Series head
  2. MK1-250 Extruder for Standard Filament Videos:
    1. Yt.png Overview
    2. Yt.png Loading and Printing
  3. MK2-250 Extruder for Flexible Filament Videos:
    1. Yt.png Overview
    2. Yt.png Loading and Printing
  4. MK1-450 Extruder for High-Temperature Filament Videos:
    1. Yt.png Overview
    2. Yt.png Loading and Printing

Please see our Data Sheets as well.


The following table compares the properties of the various Filament heads, including which heads are recommended for which materials. The MK1 heads drive matieral from one side, with a spring-loaded bearing system to maintain pressure and positioning. The MK2 heads drive the material from both sides, and are designed for more flexible filaments.

Filament Head Properties
Head Min Temp Max Temp Filament Type Nozzle Recommended For Description
MK1-250 150°C 250°C Standard .35, .50, .75, 1.0mm ABS, HIPS, LayBrick, LayWood, Nylon, PC, PET, PETG, PETT, PLA, PP, PVA, T-Glase Standard Filaments
MK1-450 275°C 450°C Engineering .30, .40, .50mm PEEK, PEI (Ultem), PEKK, PPSU High Temperature filaments
MK2-250
extra torque
150°C 250°C Flexible .35, .50, .75, 1.0mm BendLay, EcoFlex PLA, FilaFlex, Flex45, Ninjaflex, PlastInk Rubber Extra Torque for Flexible Filaments
HT-250
high torque
150°C 250°C Standard .30, .40, .50mm ABS, HIPS, LayBrick, LayWood, Nylon, PC, PET, PETG, PETT, PLA, PP, PVA, T-Glase High Torque for Standard Filaments
HT-450
high torque
275°C 450°C Engineering .30, .40, .50mm PEEK, PEI (Ultem), PEKK, PPSU High Torque for High Temperature Filaments

Research Papers Citing Hyrel Filament

These are now listed by year here.

Firmware Versions for Filament Heads

As of May, 2018, the following versions should be used for Repetrel versions 2.x and 3.x:

Use _FIL_250_PLAT_1A.hex :

  • For MK1-250 and MK2-250 heads.

Use _FIL_450_45A.hex :

  • For MK1-450 heads.

Use _FIL_250_RED_235A.hex :

  • For older MK1-250 heads with RED RTDs.

Settings for Filament Heads

V2: Non-Hydra units shipping through spring 2017 shipped with Repetrel version 2.x.

V3: Hydra units, and other units shipping summer 2017 through summer 2019 shipped with version 3.x, and should consult the version 3.x tables, below. All units should be upgraded to 3.x when it is available. If you run a head with v2 settings on a v3 install, the background will flash red; please make the changes below, from red to blue.

V4: All units shipping as of late summer 2019 are shipping with version 4.x, which has more fields for the heads. Please see below.

Values for versions 1.x and 2.x will be inicated in RED.
Values for version 3.x will be inicated in BLUE.
Values for version 4.x will be inicated in GREEN.

Note that you must flash these settings to the head to make them the new default.

Some settings for the MK-Type heads (like temperature, prime/unprime values) will vary, depending on what material you are printing with. Nozzle diameter should accurately reflect what nozzle you have loaded (0.5mm is default) AND what path width you sliced for (recipe path or extrusion width should be nozzle diameter plus 10%). Having said that, here are our default shipping settings:

Settings MK1-250, MK2-250 MK1-450 HT-250 HT-450
Material
Type (any) (any) (any) (any)
Color (any) (any) (any) (any)
Nozzle 0.500 0.500 0.500 0.500
Layer (any) (any) (any) (any)
Temp Info
Print Temp 240 410 240 410
Power Factor 100 100 100 100
Minimum 0 290 0 290
Maximum 250 450 250 450
Overrides
Pulses 0.78 / 78 / 78 0.78 / 78 / 78 1.75 / 175 / 175 1.75 / 175 / 175
Multiplier 1.000 1.000 1.000 1.000
Prime
Steps 200 200 300 300
Rate 10,000 10,000 10,000 10,000
Dwell Time 20 / 35 / 35 20 / 35 / 35 20 / 35 / 30 20 / 35 / 30
Before Tool Change 2 / n/a / n/a 2 / n/a / n/a 2 / n/a / n/a 2 / n/a / n/a
Unprime
Steps 200 200 300 300
Rate 10,000 10,000 10,000 10,000
Dwell Time 15 / -35 / -35 15 / -35 / -35 15 / -30 / -30 15 / -30 / -30
After Tool Change 2 / n/a / n/a 2 / n/a / n/a 2 / n/a / n/a 2 / n/a / n/a
Offsets
Clone Head Off Off Off Off
X 0,000 0,000 0,000 0,000
Y 0,000 0,000 0,000 0,000
Z 0,000 0,000 0,000 0,000
Head Info
Model MK1, MK2 MK450 MK1, MK2 MK450
PCB Type n/a / n/a / 4988/160J n/a / n/a / 4988/160J n/a / n/a / 4988/160J n/a / n/a / 4988/160J
RTD Type 1k_PLAT 1k_PLAT 1k_PLAT 1k_PLAT
Motor Current High / High / n/a High / High / n/a High / High / n/a High / High / n/a
Step Mode 16th / 16th / n/a 16th / 16th / n/a 16th / 16th / n/a 16th / 16th / n/a
Plot Settings (any) (any) (any) (any)
Motor Settings
Step Mode n/a / n/a / 16th n/a / n/a / 16th n/a / n/a / 16th n/a / n/a / 16th
Motor Current n/a / n/a / Normal n/a / n/a / Normal n/a / n/a / Normal n/a / n/a / Normal
Max Jog Rate n/a / n/a / 1,500 n/a / n/a / 1,500 n/a / n/a / 1,500 n/a / n/a / 1,500
Rot Speed n/a / n/a / 1,500 n/a / n/a / 1,500 n/a / n/a / 1,500 n/a / n/a / 1,500
Settings MK1-250, MK2-250 MK1-450 HT-250 HT-450

Changing Nozzles

How to disassemble the nozzle from the MK1 head:

  1. Carefully:
  2. Heat to the printing temperature of the material loaded.
  3. Move the manual lever to the left, retracting material until it is free of the hobbed shaft, then remove by hand.
  4. Turn off heat to the head and remove it from the yoke.
  5. With a 1/4" driver or wrench, remove the nozzle.
  6. 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:

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