1. Hello Folks,

    I have been running two MK2S Prusa's for over a year now and they are now upgraded to the MK2.5S. The expense is worth it in my view and will be buying some MK3S's shortly for business production. The items that I find interesting is that so many of the 3D printing world does NOT take into account the tolerances of the plastic that is being extruded, Now for organic and non engineering parts you can get away with that. The moment you step into anything that has tolerances you really have to pay attention to what your expansion/contraction ratios are for a given plastic.

    Has anyone else run across this type of issue?

    Michael
    CAD software Shark Pro v10, Also Aspire v9.0
    CAM Software Aspire v9.0, CamBam v1 beta12
    CNC Machine: http://www.mycncuk.com/threads/3661-...Second-machine
    3D printers: 2 x Prusa MK2S soon to be 2.5's and 1 x mini Delta (180 x 180)
    Work with Solid Surfaces, Acrylics, Woods, Foamboard, PLA, ASA, PMMA
    Work Computer: Lenovo D20, K4000, Tesla C2070, 64GB RAM

    www.marino-customs.com

  2. The Following 2 Users Say Thank You to m.marino For This Useful Post:


  3. #2
    I have, I use ABS and when I print a hole, it is always smaller than designed. Where it is critical, I run a drill or reamer through. There may be guidelines for the spreading of the extrusion, but I find it easier to design out criticality of dimensions.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  4. The Following 2 Users Say Thank You to cropwell For This Useful Post:


  5. #3
    I measure filament.
    My printer makes parts absolutely predictably 0.15 past the edge of the model, both internal and external, allowing me to compensate precisely and make on size parts.
    You think that's too expensive? You're not a Model Engineer are you? :D

  6. The Following 2 Users Say Thank You to magicniner For This Useful Post:


  7. #4
    Doddy's Avatar
    Lives in Preston, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 5-6 years. Has a total post count of 414. Received thanks 80 times, giving thanks to others 12 times.
    Just a curve-ball... the resin printers (and I'm thinking the Anycubic in particular) are becoming rather affordable and offer quality (and dimensional accuracy) far beyond what my fdm machines has achieved. Build platform size is the compromise, as well as buggeration in post processing but its impressed the hell out of me. There are some limitations particularly for "engineering" designs (rather than organic modelling) but they are at a price that makes them interesting.

    Hint: I managed to print modelled internal separate M3 tapped holes in a printed enclosure (4 in each of 3 enclosures) that each worked flawlessly without any post-processing beyond UV curing. Presentation of the model is almost presentable (this is the area I'm concentrating on)
    Last edited by Doddy; 14-04-2019 at 07:59 PM. Reason: rewritten in English

  8. The Following User Says Thank You to Doddy For This Useful Post:


  9. #5
    Quote Originally Posted by magicniner View Post
    I measure filament.
    My printer makes parts absolutely predictably 0.15 past the edge of the model, both internal and external, allowing me to compensate precisely and make on size parts.
    Measure ? Length? Nick, how does this work?

    I presume you mean diameter to be within spec. I also presume that your spreading figure is 0.15mm and is independent of the model X and Y dimensions.

    Cheers, Rob-T
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  10. The Following 2 Users Say Thank You to cropwell For This Useful Post:


  11. #6
    Quote Originally Posted by cropwell View Post
    Measure ? Length? Nick, how does this work?

    I presume you mean diameter to be within spec. I also presume that your spreading figure is 0.15mm and is independent of the model X and Y dimensions.

    Cheers, Rob-T
    Rob,
    Yes, the filament is rarely bang on size but the slicer assumes you gave it a precise diameter for volume calculation so I correct for variation in filament OD.
    Bang on with "Spread" too ;-)
    You think that's too expensive? You're not a Model Engineer are you? :D

  12. The Following 2 Users Say Thank You to magicniner For This Useful Post:


  13. #7
    Nick,

    It may be that the slicer I use is just too vanilla for the niceties of compensation for filament diameter. I use Makerbot slicer, an old version as the new one wants me to log on and asks me awkward questions about my Makerbot machine, which is a Wanhao 4DS. I think I may have a look at Cura, which I use for turning jpegs into lithophanes etc...

    However, for what I do, accuracy is not so important.

    Rob
    Last edited by cropwell; 14-04-2019 at 10:14 PM.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  14. The Following 2 Users Say Thank You to cropwell For This Useful Post:


  15. Yeah measuring the filament is something that gets done on all incoming spools as they vary. SLA/DLP is getting down in price point but I am waiting for SLA1 as they have been doing a lot of work to make it work with as many resins as possible and i have clients in different fields who have interest.
    CAD software Shark Pro v10, Also Aspire v9.0
    CAM Software Aspire v9.0, CamBam v1 beta12
    CNC Machine: http://www.mycncuk.com/threads/3661-...Second-machine
    3D printers: 2 x Prusa MK2S soon to be 2.5's and 1 x mini Delta (180 x 180)
    Work with Solid Surfaces, Acrylics, Woods, Foamboard, PLA, ASA, PMMA
    Work Computer: Lenovo D20, K4000, Tesla C2070, 64GB RAM

    www.marino-customs.com

  16. The Following 2 Users Say Thank You to m.marino For This Useful Post:


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. NEW MEMBER: From grinder to 3D printing to CNC
    By laranjas3 in forum New Member Introductions
    Replies: 2
    Last Post: 12-10-2017, 05:59 AM
  2. Metal 3D printing
    By mekanik in forum 3D Printing Machines
    Replies: 5
    Last Post: 28-07-2017, 05:38 PM
  3. 3d printing gears
    By mekanik in forum General Discussion
    Replies: 7
    Last Post: 26-07-2017, 02:59 PM
  4. NEW MEMBER: 3d printing to CNC
    By AVRnj in forum New Member Introductions
    Replies: 27
    Last Post: 04-04-2013, 10:09 PM
  5. 3D Printing Coming Along
    By Washout in forum 3D Printing Machines
    Replies: 7
    Last Post: 04-10-2012, 09:21 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •