Stacked face shields on mk2S
 
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cedd
 cedd
(@cedd)
New Member
Stacked face shields on mk2S

Hi all

apologies if this is a noob question. 

I had great success printing the face shields on the printer at work (Mk3S with MMU2S) and am now trying to print them on my own printer which is a mk2s. 
I’ve taken the Prusa slicer files and tried changing printer type back to the mk2s but the printer just ends up hitting the micro switches every time resulting in overlapping face shields on only the front half of the bed. I also tried the gcode without changing the printer type first (leaving it as the Covid-19 user printer) and this had the same results. 
I just want to produce as many as I can overnight. I’ve tried working out how the stacked print was assembled in slicer to do it myself, but I just can’t work it out. Can anybody talk me through getting a stack of these (ideally 2 stacks of 8 if they can fit) working on a mk2s please?

thank you!!!

Posted : 12/04/2020 6:29 pm
bobstro
(@bobstro)
Illustrious Member
RE: Stacked face shields on mk2S
Posted by: @cedd

[...] I just want to produce as many as I can overnight. I’ve tried working out how the stacked print was assembled in slicer to do it myself, but I just can’t work it out. Can anybody talk me through getting a stack of these (ideally 2 stacks of 8 if they can fit) working on a mk2s please?

Not to be a downer, but the designer does not recommending stacking the Verkstan design with single extruder printers. The bottoms are too rought and stringy and difficult to sanitize. The FAQ page addresses stacking:

This is of course something that we’ve been thinking about since day one. The reason we have been a bit hesitant in recommending and providing files for this is mostly down to quality control. The print quality of frames we have already received has varied greatly and we have unfortunately been forced to throw a fair number of prints away due to quality issues.

The main problem we’ve seen is prints that have a very rough finish such as open top surfaces. This makes it very difficult to properly disinfect the parts which is of course not acceptable. We have also seen prints that are not structurally sound and risk breaking apart, again something that we cannot risk happening.

Stacked printing represents an even bigger risk in getting prints that are not up to the standards needed, especially on single extrusion printers.

I'm seeing a lot of posts by people boasting about how many they've pushed out with very little discussion of usability or safety.

I'm just happily chugging out a tray of 2 per hour of the NIH design (what we've been asked to focus on in MA) and using it as a Pomodoro break timer while I work. I'll start a large tray of ear savers or something similar overnight.

Good luck printing! Feel free to DM if you have any specific questions you need a quick answer to.

 

My notes and disclaimers on 3D printing

and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

Posted : 12/04/2020 7:05 pm
cedd
 cedd
(@cedd)
New Member
Topic starter answered:
RE: Stacked face shields on mk2S

Interesting, thanks for the reply.

the successful prints on the work machine were for the 3DCrowd UK drive and they seemed to be pushing the stacks, so it’ll be interesting to see the feedback from them after this first wave of printing has finished.

I’m actually doing the opposite of you - I’m doing ear savers by day (14 every hour and 20 minutes) but I’ve struggled to stack them so the printer is sitting idle for much of the night. I was hoping to do an overnight stack of visors to keep the machine being useful while I slept. 
I guess the ear savers would stack ok but I just can’t seem to get it right, and can’t afford the printer downtime to play with it too much. Also everything I’m doing has the backdrop of a bored 2 1/2 year old who misses going out and her friends from nursery, so it’s hardly an environment conducive to tinkering!

Posted : 12/04/2020 7:32 pm
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