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magnets in extruder upgrade bag, and other questions  

Estimable Member
magnets in extruder upgrade bag, and other questions


I received my MK3MMU2->Mk3sMMU2s upgrade and upgraded it yesterday.

1) What are the magnets usually used for that are in the e-axis bag (and spare bag)?
The manual did not mention using then anywhere.

2) has anyone tried printing with flexibles yet? (without the MMU, by directly feeding into the extruder)

3) Do I still calibrate the bowden length? I assume not because the new sensor will react only on the exact time the filament reaches the gears, so calibrating the tube length should be irrelevant/automagically recognized.

4) Is there a "Changelog" somewhere? I would appreciate a concise list of things that I now have to do differently than before the update.

Posted : 12/04/2019 8:23 pm
Re: magnets in extruder upgrade bag, and other questions

1) The magnets are used if you want to remove the MMU2 and make a "stock" 3S configuration (the sensor works a little differently).

3) Correct, it is no longer required.

Posted : 12/04/2019 8:42 pm
Antient Member Moderator
Re: magnets in extruder upgrade bag, and other questions

As for calibrating the MMU, the firmware is supposed to adapt the feed according to the loading and sensor triggering.

However, I have found that calibrating to the centre of the Bondtech really can help, especially with first loads.


Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Posted : 12/04/2019 9:52 pm