Multi Color H2C
Four-slot AMS printer for multi-colour work in PLA and CoPE.
This is the multi-colour machine. Its four AMS slots run PLA and CoPE in a single print, with a purge tower carrying the transitions; those transitions are where multi-colour prints usually go wrong, which is why the quick start has you watch the first color changes and not just the first layer.
Quick Start
Settings
Verified profiles. The purge values matter as much as the temperatures here.
| Parameter | Value |
|---|---|
| Nozzle temp | 200-215C |
| Bed temp | 55-60C |
| Speed | 80-120mm/s |
| Cooling | 100% |
| Retraction | 0.8mm @ 30mm/s |
| Purge volume | 150-200mm³ |
| Purge tower | Recommended for all color changes |
Troubleshooting
Increase the purge volume between colors by 50-100mm³ and enable the purge tower in the slicer. Check the flush settings for each color pair, and run AMS calibration so filament retraction behaves.
Check the spool isn't tangled, then gently push the filament by hand to help the AMS grab it. Verify the PTFE tube isn't kinked, reseat the spool in its slot, and clean the AMS feeder gears if they're clogged with filament dust.
Heat the nozzle to 250°C (the higher of the two material temps) and manually push filament through. Cool to 90°C and perform a cold pull; if it's still clogged, use an acupuncture needle, and replace the nozzle as a last resort.
Verify the purge tower position on the bed (it must not overlap the print), adjust the purge volume in the slicer, and make sure the tower has a minimum of 5-10 layers to stabilize. Check that the tower is adhering to the bed.
Re-level the bed using auto-leveling and clean the plate with 99% IPA. Adjust the Z-offset (0.1mm with a feeler gauge), lower first layer speed to 20mm/s, and apply glue stick for CoPE layers.
Check belt tension (~100Hz twang) and inspect for mechanical obstructions. Reduce print speed by 30%, and verify the print head isn't colliding with the purge tower.
Repair Guides
Difficulty: Easy · Tools: Nylon filament or cleaning filament
Heat the nozzle to 250°C and manually extrude filament until it flows smoothly. Set the nozzle to cool to 90°C, then firmly yank the filament out at that temperature. Inspect the pulled filament for a clean nozzle impression and repeat 2-3 times if the clog persists.
Difficulty: Medium · Tools: 2.5mm hex key, replacement PTFE tubes, tube cutter
Remove all filament from the AMS, open the AMS hub connections, and unscrew the pneumatic fittings to free the old PTFE tubes. Cut the new tubes to exact length, insert them fully into the fittings, and test the filament path for each slot.
Rules
- Supervise the first layer and the first color transition of every multi-color print.
- All 4 AMS slots must be loaded before starting any multi-color print.
- Clean the build plate with 99% IPA before and after every print.
- Report all AMS feeding errors, tangled spools, or color mixing issues to exco immediately.
- Remove all filament spools from the AMS after printing and store in dry boxes with desiccant.
- Do not run unattended overnight prints without exco approval.
- Log all print jobs (colors used, duration, username) in the workshop registry.
- Do not mix PLA and CoPE in the same print without proper purge tower settings.
- Firmware updates are restricted to exco members only.
- Do not manually force filament through the AMS; follow official protocols.