3D Scanning & Printing

1 - 3D printing.

2 - 3D Scanning

During few years, the additive technologies make a lot of progress, Now you could find a nice 3D printer for some hundred euros.
At the Fablab we have different printer solutions.

For this week assignement i principaly use the Alfawise U20, Alban work on the creality one.
the U20 is a Fuse deposition modeling printer, it work by fusing a plastic filament and deposit it on a thin layer.
layer after layer it print the 3d model we want. On this Alfawise printer we have a 300*300*400mm place to work and modelize.

I start by testing the design rules for the printer.
For this i dowload the "MICRO"All in One 3D printer test by Marián Trpkoš.
This piece test the capacity of a 3D printer in:

  • - Bridging
  • - Stringing
  • - Sharp corner
  • - Scale / Diameter
  • - Tolerance
  • - Overhanging

I working with the Volcano PLA filament by Formfutura, this a great result filamant with a lot of capacity.
Before the print i do a bed leveling with a simple papersheet, i pinch it betwin the nozzle and the bed, the paper have to show a little resistance to move but not to be stuck.
I use Curafor slicing my STL file. After i set all my parameter on it, he gonna create a multi-layer slicing of the object & convert it on a GCode, able to move the printer.
Go to launch the print.

Setting:

  • layer height: 0.1mm
  • Wall width: 1.2mm
  • Top & Bottom thickness: 0.8 mm
  • Infill: 20% with a Gyroid pattern
  • Nozzle temperature: 220°C
  • Bed temperature: 60°C
  • Print speed: 60mm/s
  • Build adhesion: None
  • Support: None

The printing starting well,wait a few moment.... (3 hours later) Oh it's finish.
the result looking very nive, clever surface finish, no stringing, a very small warping, overhang ok and bridging looking not so ugly

Let's check the measurment.

  • - tolerance test wall: 0.45 & 0.50 mm only (about 0.01mm), she don't print the other.
  • - tolerance hinge : nice on the 0.5 & 0.45 mm (again about 0.01mm and all the other hinge was not usable.)
  • - Scale & diametre : 13.77/14mm; 7.83/8mm outside. 9.42/10mm ; 3.34/4mm inside
Ok have a really nice result.

An object that could not be made subtractively.

I starting this project with the idea of a gyroscopique modules & when i start to sketch it on fusion, this idea become a "ball on ring" gyroscopique fidget-toy.
"ballring files"

Ok design finished i use the "tool-> make-> 3D print" in fusion for directly send the STL to Cura, set the print and let's go.

Setting:

  • layer height: 0.1mm
  • Wall width: 2mm
  • Top & Bottom thickness: 0.8 mm
  • Infill: 0% (no infill needed du to the wall thickness)
  • Nozzle temperature: 220°C
  • Bed temperature: 60°C
  • Print speed: 60mm/s
  • Adhesion: None
  • Support: None

Nice print & really fun toy ^^.

Let's try to print this on resin with the Formlab2.

This Printer is a SLA (StereoLithography Apparatus) technologies, it use a laser to polymerize a resin in very precise layer.
I use, again, the "tool-> make-> 3D print" of fusion to imports my STL on "Preform". For a good result i have to inclinate a little the piece & place some supports, after that i launch the print.

Setting:

  • layer height: 0.05mm
  • Support density: 0.70
  • Contact point size (support): 0.45mm

The Formlab2 have a autofilling resin system, just check the vent of the cartridge is open before launch.

"With Resine Wearing gloves,mask & glass are recommanded"

In contrary of The FDM system, here the piece is print Upside-down, it's the bed going down to dive on the resine bath, the laser light the bed to polymerize & the bed go up. Betwin each cycle the machine move the resin to have no deposit.

After the print the piece look full of resine, now i have to clean, for this i use a "ultrasonic isopropanol bath machine", it take off all the no-polymerize resine off the printed pieces.
After this bath i take the piece off the printerbed,for finished the resine polymerization process i have to put the pieces on a UV oven for an hour, in the same times i clean the printerbed with somme isopropanol.

After his UV bath the piece is not finish, i have to take off all the support and a little off post processing to be clean.
But the result is a very smoth and clear "ball-ring" fidgettoy ^^

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