26 Reply by TickTock

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Re: If you could restart your investment which Printer would you buy?

redbarret wrote:
TickTock wrote:

Vibrations much smaller than I can see...will result in unacceptable print quality.

Just out of curiosity, why?
Forgive my lack of basic knowledge on this.

Means the part will not be where the printer thinks it is and will apply the filament in the wrong place.  Consider an exaggerated scenario where you are putting down a line on the Y axis.  If the part is tall and has mass, it will tend to continue to move even though the bed has stopped and you will overshoot the end before bouncing back.  I guess this would manifest as little bumps near the top at the corners of a tall, square model.  If I had access to a Prusa, it would be fun to make a diabolic model to illustrate this - a square hourglass or something like that.

27 Reply by jagowilson (edited by jagowilson 2015-02-02 22:02:01)

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Re: If you could restart your investment which Printer would you buy?

The extruder motor on a Solidoodle vibrates like a cellphone at my travel speeds of 150mm/s and infill speeds of 85 mm/s and this doesn't significantly effect fit or look of the part, and the extruder assembly+hotend weighs significantly more than your average print. With a secure hotend and mechanically rigid axes it hasn't really been a problem for me. My extruder assembly is as tight as I can possibly manage.

Granted, If I want a perfect print I slow my infill speeds because you have to print pretty hot for those speeds, which has numerous downsides (poor bridging being the main thing).

High gap fill speeds also cause severe  vibration without significant consequences.

28 Reply by TickTock

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Re: If you could restart your investment which Printer would you buy?

I am just saying the phenomenon is there but am learning from this thread that it is, indeed, negligible.  Even for the rare diabolic print (i.e. square hourglass) you can always add supports so if you guys say it's not a problem, I believe you.

29 Reply by jagowilson

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Re: If you could restart your investment which Printer would you buy?

All this discussion makes me want to get something like an Ord and do some high speed comparisons.

30 Reply by redbarret (edited by redbarret 2015-02-02 22:42:11)

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Re: If you could restart your investment which Printer would you buy?

TickTock wrote:

Means the part will not be where the printer thinks it is and will apply the filament in the wrong place.

How thin does an ABS print need to be and how fast does the print bed need to move for that to happen though? I know you agree that this is likely not an issue too, I'm just curious. It's hard for me to imagine that happening.

Solidoodle 4

31 Reply by TickTock (edited by TickTock 2015-02-03 14:08:07)

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Re: If you could restart your investment which Printer would you buy?

Depends on the model.  I am sure there are some shapes that, without support, cannot even be printed on a Prusa type but can on a Solidoodle but maybe nothing realistic.