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Mark Wheadon
403 followers -
The one and only. Accept no substitute.
The one and only. Accept no substitute.

403 followers
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A question: how hot does your Prusa i3 MK3 extruder stepper get?

Hi guys – I've been reading around, and it seems that perhaps my extruder stepper isn't unusually hot for an Original Prusa i3 MK3, but I'm just seeking reassurance.

So, running ASA at 255C, 100C bed and an enclosure, the stepper gets hot enough that I can only hold my finger on it for a couple of seconds before that becomes too painful.

Is that really par for the course?

The filament path is clear (undoing the extruder to release the hobbed nut means I can push the filament through the hot nozzle with the usual level of resistance).

The stepper spins with my finger, so it's fine.

The free hobbed nut spins fine.

It prints fine.

But it's damn hot. 100mm/s target speed, no slowdown for infill, the usual retraction settings, 255C/100C, ASA. It's still hot without the enclosure.

Mark

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I had my retraction settings (or perhaps the temperature) less than optimal on this Polysmooth (PVB) print and decided to trim and style the resulting hair. Meet long-haired +Louise Driggers Adalinda. Ain't she cute?

My daughter now won't let me trim and smooth her (Adalinda that is, not my daughter) 👏
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Ooh! If you have, or are waiting for, or intend to buy a Prusa i3 MK3 then this is exciting stuff:

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Hi folks – here's a video I've just released that shows how to replace the PEI sheet on the Prusa i3 MK2/S without the hassle of removing the print bed.

It documents both how to, and how not to do it ;-) Spoiler: don't use heat.

Hope it proves useful.

Mark

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The things I get to print for my hub customers. They're nothing if not varied ;-)

10 x OK Hand (Wanhao Duplicator i3 sample)
https://www.thingiverse.com/thing:2216106

👍
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Help!

My Prusa i3 MK2S after hundreds (thousands, I suspect) of hours behaving has started moving its Y axis too far. Any ideas?

I'm trying to calibrate the printer after it started behaving oddly after a print went badly wrong (loads of spaghetti overnight).

Whilst the calibration is taking place, the printer stalls the Y axis, at both ends of the travel -- I can see it's up against the end stop (bearing at the front, switch at the back) and I can hear the thump-thump of the stepper skipping, so it's not having its movement restricted, it really does seem to be moving too far.

Needless to say the calibration is failing.

Any ideas people? I'm stumped and I have a load of printing I'm supposed to be doing for others :(

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Sunday morning – time for a spot of +Josef Prusa i3 MK2 printer maintenance.

I now understand a lot more about the PEI bed and ABS, PETG, TPU and so on so the next PEI sheet should fare a lot better!
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+Simplify3D and a tricky print (hole very near the edge). V3 on the left, V4 with "Allow single extrusion walls" on the right. Note the way the single perimeter is actually shaped around the hole (waisted in the middle). Nice one!

I wonder why the option isn't on by default?

#3DPrinting
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+Simplify3D and a tricky print (hole very near the edge). V3 on the left, V4 with "Allow single extrusion walls" on the right. Note the way the single perimeter is actually shaped around the hole (waisted in the middle). Nice one!

I wonder why the option isn't on by default?

#3DPrinting
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Live Hinge Foldable Phone Stand #3DThursday #3DPrinting
https://blog.adafruit.com/2017/06/01/live-hinge-foldable-phone-stand-3dthursday-3dprinting/

Shared by stalljd2 on Thingiverse:

Nice little Phone stand that is about credit card size. I did make it in PLA and it worked better than I thought it would. I modeled this after a little phone stand I got a while back, I could find anything like it on the interwebs so I thought hey I’ll just model up a new one and print it instead!!!

Read more: https://blog.adafruit.com/2017/06/01/live-hinge-foldable-phone-stand-3dthursday-3dprinting/
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