Tips / FAQ
Which board should I use?
The recommended board for the 3MS is the SKR Pico due to its compact size, reliability, and cost-effectiveness.
What sensors do I need?
To use the 3MS, you need a sensor between the exit of the Y-splitter and your printer's extruder. If it's closer to the Y-splitter, it's considered a shared gate sensor while if it's closer to the extruder it's called an extruder entry sensor.
Do I need a filament cutter?
Using a filament cutter is highly recommended as it takes a lot of the guesswork out of tuning tip forming. A quick Google search of "filament cutter for [MY PRINTER]" is usually good to find a filament cutter for your printer.
If there isn't a filament cutter published for your printer, you have two options:
-
Design your own
-
Tune tip forming
The latter option may seem easier at first, but tip forming isn't as straightforward as you might think.
Here are a few general tips:
- If your tips come out stringy, use more cooling moves and a lower temperature. Also, skinnydip string reduction can help here.
- If your tips come out with a larger tip, use less cooling moves and a higher temperature.
- Use Happy Hare's
_MMU_FORM_TIPmacro to help tune your tips.
Why isn't MMU_LOAD/MMU_UNLOAD loading/unload the filament enough?
Run the below command in Mainsail/Fluidd:
The output will show exactly what Happy Hare does on load and unload. You can look at the referenced parameters (editable in mmu_parameters.cfg) and adjust as necessary to get your load/unload just right.