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Messages - Bad Raven

Pages: [1] 2 3 ... 14
General Discussion / Prusa "Stats"
« on: January 20, 2019, 10:11:19 PM »
Over 500 Printers running in the production farm.
Over 320 employees
Over 1000 packages leave the factory every day (inc Filament, Upgrades, MMU, etc)
Over 6000 printers sent out a month

25% of printer production time spent on Checking/Quality Control/Heat Soaking, etc.

Wonder how that compares to other makes?

General Discussion / Bed Adhesion
« on: January 11, 2019, 05:48:09 PM »
Yes, I know, boring..................

I have no problems with getting adhesion when printing.............. except when the object needs a lot of supports, when at a late stage in the print it only too frequently releases cleanly off the bed.

I'm on the Prusa Mk3 using Slic3rPE and PLA, and it does not seem to make any difference on using any of the preset print settings.

Anything avoiding supports seems to work fine.

Any tips/constructive thoughts please?

This is the one I have :-

Had it two years, used more than once weekly on tanks, prob overall 3/4 times a week in all.

(It was only 9 then!!)

Cheers. Looks good.
Tanks? water or Army?

My post of January 06, 2019, 07:19:36 AM refers.  :smiley:
You did sorry.  Fishy ones   ::)

Well, and Shrimpy ones!  ::)

General Discussion / Re: Did 'YOU' print today?
« on: January 11, 2019, 05:27:18 PM »

This is the one I have :-

Had it two years, used more than once weekly on tanks, prob overall 3/4 times a week in all.

(It was only 9 then!!)

Cheers. Looks good.
Tanks? water or Army?

My post of January 06, 2019, 07:19:36 AM refers.  :smiley:

General Discussion / Re: Did 'YOU' print today?
« on: January 06, 2019, 07:29:00 PM »
Great, how does she scale to the Hatter and Cat?

This is the one I have :-

Had it two years, used more than once weekly on tanks, prob overall 3/4 times a week in all.

(It was only 9 then!!)

General Discussion / Re: Prusa PEI coating
« on: January 06, 2019, 07:29:44 AM »
This was an as supplied bed PEI layer on the spring steel (double sided).  I know back in May when I got the printer it worked perfectly as I tried both sides.

NOTHING I did improved it, including in the end repeated Acetone (100%), and yet all it had done was sit under the blue sheet I'd applied over the top, mostly face down on the heat bed as I had printed far more PLA to the PEI exposed side than the blue tape with PETG and Flex. It looked no different.

Either it had aged or the blue tape adhesive affected it.  I actually applied a new PEI sheet on top of the ultra thin old, adjusted Z and it  is now fine with no other changes

A while back I bought a thermal measurement "gun" with laser targetting, really cheap from Banggood.  While actually bought for matching fish tank water changes, it has proved useful for temp checks on quad components, house insulation, etc.

I have used it a number of times to check bed temperatures on both my 3D printers.  It check matches closely against a number of other temp indicators, fish tank submerged and LCD strip, fridge and freezer, so I am reasonably confident it reads correctly.

This has shown up that my policy of allowing preheat to run for a while before attempting a print is helping to ensure an even bed temperature at all points.

I have though been a little surprised how the Prusa i3 Mk3 bed is NOT at the temp indicated on the LCD panel, there is always a significant difference, the actual being lower than indicated.

While items print fine, and bed adhesion is normally not an issue at this lower temp, out of curiosity I set the printer up a number of times so the actual was what is stated as the mid of the temp range for that filament.  And the results were poor, with stringing and even bed shift evident.

Cross checking reaffirmed the gun is accurate.  I know what works and am able to check easily, so have not gone any further.

The Fab II Mini seems to set bed temp much closer to that stated by Repetier, with good correlation, and its noticeable that display bed and extruder temps are always roughly 5-10 degrees lower than the i3 Mk3 displays on its screen.

If you do not have one, one of these guns would therefore be a useful way to see bed temp at spots to check evenness and alignment to that shown by the display so an offset can be used with confidence.

General Discussion / Prusa PEI coating
« on: January 04, 2019, 02:56:55 PM »
You may know that the Mk3 Prusa came with a spring steel bedplate which is covered both sides with a PEI "sticker" sheet.  More recently the much vaunted powder coated bed plates have started to appear on new purchases but I do not have that.

I have the older type, which has been excellent. I taped one side with blue tape (Hobbyking sheet) for PETG and kept the other for PLA.

This worked well.

I then recently decided to remove the blue tape and use that side bare PEI for PLA.  Obviously I took great care to remove any adhesive and cleaned up with acetone and then IPA.

And, the adhesion was rubbish. Several repeat treatments later, still rubbish, so I recovered it with a new PEI sheet and it was fine again.

So, did the tape covering, it's adhesive, or the constant heating that side affect it?  Something did!

General Discussion / Re: It pays to experiment
« on: December 30, 2018, 11:25:43 AM »
Id avoid using a printbite surface (which is what you have iirc from the other days description) as it grips to it like a limpet :angry:

Yea, know that NOW..............   :laugh:

the only problem with using painters tape (the blue stuff) is it often colour transfers onto the model which can be proper annoying, you might want to try just using normal standard white masking tape with flexi, its lacks a little less grip ability than the blue stuff but with flexi thats actually a bonus half the time.

I do not use painters blue tape, I use the blue tape sheets that HobbyKing sell, and with lots of use on various materials (but not ABS as I have never used it at all) it has not ever transferred colour.

General Discussion / Re: It pays to experiment
« on: December 29, 2018, 04:28:24 PM »
I had to use blue tape to reduce its adhesion as it was far too high.

General Discussion / It pays to experiment
« on: December 29, 2018, 08:19:55 AM »
, even if accidentally!

I have some HKing Flex filament. I was having trouble finding the right settings for it, with both stringing and erratic layering evident on various Flex presets and with my "tuning" attempts.

Then I made a mistake, and gcoded something intended for Flex as PLA. And it printed superbly well with no loss of flex strength.

Oh Well.......................    :embarrassed

General Discussion / Re: Did 'YOU' print today?
« on: December 29, 2018, 07:45:48 AM »

Misses got me a roll of Ziro marble PLA for Christmas and that's the result of the first print.

The White for me please.........................  Oh, are we talking about the model?

Looks good. The flecking is maybe a little less than I'd consider ideal, but on that model looks great.

Another for the list.  :rolleyes:  At this rate I'll need another shelf and a pair of library steps in my dining room!!

3d Designs / Projects / Re: Best CAD Design package 2018/2019?
« on: December 28, 2018, 07:13:59 AM »
Well, currently after trying a few I'm not at all settled on any.

Firstly, bear in mind that a few years back I spent a lot of time building 3D models for Simulators. I have literally hundreds of models out there as Freeware.  I used a combination of software but mostly the (VERY expensive) 3dsMax (was 3d Studio).

Now to modern software and me.  And, I can't get on with any of them!

I first tried Blender, which is a real mess with such a painful GUI you might well struggle to find out how to even delete a complete model, let alone a part of one.

Currently I am messing around with Trimble, FreeCAD, Fusion360, SketchUp, jury is out, may be a while!!

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