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Click changeable hotend  

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Linux User Group Oberschwaben
(@linux-user-group-oberschwaben)
Estimable Member
Click changeable hotend

Hi

Have you seen this -> http://www.thingiverse.com/thing:1246951

I think this is great idea for mk 3 update 🙂

What do you think ?

Veröffentlicht : 04/09/2016 12:43 am
3Delight
(@3delight)
Moderator Moderator
Re: Click changeable hotend

While I love the idea of a quick-release Hot/cold end that 'thing' is way to heavy and bulky, the entire extruder system needs to be as small and light as possible to avoid problems, especially at higher speeds.

The idea that you could say un-click a single extruder and click in a double one sounds wonderful...

Veröffentlicht : 04/09/2016 12:57 am
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Click changeable hotend

Hummm...

That looks very interesting. And just because it looks heavy doesn't mean it is. Being geared, it has a smaller motor to start with (NEMA 14) which would reduce the motor weight by around 40%.

There is weight-saving elsewhere as well (eg part fan).

Personally, I like the idea of geared extruders; they can increase the feed accuracy quite significantly, although you can't print as fast with them.

Peter

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…

Veröffentlicht : 04/09/2016 11:16 am
Ben
 Ben
(@ben)
Reputable Member
Re: Click changeable hotend

Geared extruders look awesome too 😉

I guess as long as you have a leadscrew motor with a high holding torque you can run a heavier extruder.

Veröffentlicht : 04/09/2016 11:26 am
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Click changeable hotend

Ben

No. When microstepping, stepper motors holding torque is not great.

But it's all about acceleration and mass. Increase the weight (mass) and you reduce the rate at which acceleration can occur given the same available motor power.

The firmware has values for maximum acceleration in each of XY/Z/E axes and (subject to the Jerk value) works out what it believes is the acceleration to apply to each axis and generates the steps accordingly. If there is too much mass to achieve the programmed acceleration then steps will be skipped.

Peter

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…

Veröffentlicht : 04/09/2016 12:10 pm
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