Hack Chat 0x02: Introduction to 3D Printing
Steag Center for Smart Technologies is organizing second HackChat exclusively for the Rajagiri students.
This week we are going to learn about 3D Printing Technologies.
Venue: Steag Center, KE Block Extension. Rajagiri Engineering college.
Time: 5:00 PM to 5:30 PM
Register here: bit.ly/hackchat2
No Registration Fee
salmanfaris last edited by
3D Printing is an additive manufacturing process that creates a physical object from a digital design. There are different 3D printing technologies and materials you can print with, but all are based on the same principle: a digital model is turned into a solid three-dimensional physical object by adding material layer by layer. In an additive process, an object is created by laying down successive layers of material until the object is created. Each of these layers can be seen as a thinly sliced horizontal cross-section of the eventual object.(Source:- https://www.3dhubs.com)
There is a different way to print a 3D object.
This process that converts liquid plastic into solid objects.
These 3D printing technologies are also available in desktop 3D printers. Materials are limited to resins, but new varieties have appeared recently providing strength or flexibility to the final objects.SLA and DLP 3D printers produce highly accurate parts with smooth surface finishes and are commonly used for highly detailed sculptures, jewellery moulds, and prototypes. Because of their relatively small size, they are not recommended for printing large objects.(Source:- https://www.3dhubs.com)
Material Jetting (PolyJet and MultiJet Modeling)
Material Jetting (Stratasys PolyJet and 3D Systems MultiJet Modeling) technologies are similar to inkjet printing, but instead of jetting drops of ink onto paper, these 3D printers jet layers of liquid photopolymer onto a build tray and cure them instantly using UV light.
Selective Laser Sintering (SLS)
Selective Laser Sintering (SLS) uses a laser to melt and solidify layers of powdered material into finished objects.
Fused-deposition moulding (FDM)
The FDM printing process starts with a string of solid material called the filament. This line of filament is guided from a reel attached to the 3D printer to a heated nozzle inside of the 3D printer that melts the material. Once in a melted state, the material can be extruded on a specific and predetermined path created by the software on the computer. As the material is extruded as a layer of the object on this path, it instantly cools down and solidifies – providing the foundation for the next layer of material until the entire object is manufactured.
As the cheapest 3D printing technology on the market, FDM also offers a wide variety of plastic-based materials in a rainbow of colors including ABS, PLA, nylon and even more exotic material blends including carbon, bronze or wood.(Source :- https://www.3dhubs.com)
salmanfaris last edited by
The material used will affect the mechanical properties and accuracy of the printed part, but also its price. The most common FDM materials are summarized in the table below. (Source:- https://www.3dhubs.com/knowledge-base/introduction-fdm-3d-printing
FlashForge 3D Printer Creator Pro, Metal Frame Structure, Acrylic Covers, Optimized Build Platform, Dual Extruder W/2 Spools, Works with ABS and PLA.
@salmanfaris best if you could point me to an example that works as described: getting different values depending on hoe close the finger is without really touching. nothing i tried did work yet
@salmanfaris I haven't found a good sensor module for this at all. I used a thing which was calles touch sensor and it returns only 1/0. Tried to use touchRead() but it is not sensitive apparently, only 40 and 1 more or less.
#define touch_pin_numer 33
const int VALUE_THRESHOLD = 30;
TOUCH_SENSOR_VALUE = touchRead(touch_pin_numer);
if(TOUCH_SENSOR_VALUE < VALUE_THRESHOLD)
Serial.println ("Touch ON");
Serial.println ("Touch OFF");
should show something between 40 (current max) and 1 (current min) the closer the finger gets but it shows 40/41/39 and 1 - nothing inbetween. got this code from the web
@FlorianB Can you share the code, output window/error and details of the sensor module?
Hi! I am trying to add an capacitive sensor to the ESP32, that will work through glass with 3mm thickness and an distance of 8 to 2 cm. I have bought sensors which only work on touch, i have looked into the touchRead() function but cant get a steady value increase/decrease with distance and only a real touch gets me enough difference to count it as a "touch". I have checked Arduino examples with foil where a resistor can set the sensitivity but nothing worked on my ESP32. i have spent hours looking for an example, can somebody point me to one please?
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