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  1. #1
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    69
    Posts
    2,808

    Default Not metalwork but CNC: SLA 3D printing

    Hi. I had to/wanted to make some tiny plastic parts with features I could not machine from sold.
    These are gauge knobs for odometers and clocks of 38 year old Honda CX500 turbo motorbikes....
    The two knobs are 10mm diameter and 11mm and 6mm high respectively, with an internal D-shaped hole and 36 triangular shaped knurling on the periphery.
    Thinking of the resolution of my little 3D filament printer made it much too coarse.
    But I've been reading a lot about SLA resin printers lately. So I bit the bullet and bought a small one.
    That's a whole new ballgame! Resolution is down to 10s of microns....
    So I had a go at these knobs at 50micron resolution and here is the results. In the hand they look perfect, but the photos show that the resolution is actually still visible! The difference with SLA printing is that the area printing bears no relationship to the speed. It doesn't care if it prints one pixel or the whole build plate full. Only the number of layers determines the time it takes.
    So I filled it up... 11mm high - 2020 layers which took 1hour...
    This is the printer:
    https://www.ebay.com.au/i/224082610878
    The photos show the printer test (pretty impossible to make any other way), my first 'knob' print job and a close-up of the originals in the foreground with my replicas behind them.
    I'll experiment with tiny parts a bit more in time....

    Cheers
    Joe
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  2. #2
    Join Date
    Sep 2009
    Location
    Newcastle
    Posts
    217

    Default

    Maybe just the photos but the finish looks rougher than I would expect?

    I am considering a resin printer. They are getting better and cheaper rapidly

  3. #3
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    69
    Posts
    2,808

    Default

    Yes, it is just the photos. I gave them a brush with a nail brush and a bit of Armourall and now I can't tell the difference to the originals - except from the back. The originals are actually hollowed out between the outside and their bore. Mine are sold. Maybe those thin walls is what breaks them after 38 years....
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  4. #4
    Join Date
    Sep 2019
    Location
    Newcastle, AU
    Posts
    216

    Default

    Nice work Joe. It's pretty amazing what kind of machines you can get in the FDM/SLA space at the moment in terms of capability for price... this is one of the most enjoyable aspects of 3D printing, I feel - replacing things that are otherwise very difficult or impossible to source to keep something working!

  5. #5
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    69
    Posts
    2,808

    Default

    I had a go at something equally impossible to get now, but just a titch bigger than my printer envelope...
    Also the source was 3D scanned, not modelled in CAD. Interesting. The surface needed significant post processing but the part is usable.
    The part with the reflector attached is an original (opposite handed) part.
    IMG_20200916_145307_6.jpg IMG_20200916_135955_0.jpg IMG_20200916_135936_2.jpg
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

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