I've been 3D printing since 2018. This isn't meant to be comprehensive documentation—just a starting point for people who are curious and don't know where to begin.
How 3D Printers Work
This guide focuses on FDM (Fused Deposition Modeling) printers, which are by far the most common type. The process is simple: the printer lays down one thin layer of plastic on the print surface, moves up a tiny bit, lays down another thin layer, moves up again, and repeats until the object is done.
A PCB follows instructions in a .gcode file, which contains atomic commands for motor movement, temperature control, and filament extrusion. That's really all there is to it.
What You Need
- A 3D printer
- Filament
- An SD card with adapter
- A computer with slicer software
- A 3D model file (typically
.STLformat)
For models, check out Printables, Thingiverse, and Thangs.
Slicers
A slicer converts your 3D model into .gcode instructions the printer can follow. I recommend:
- Prusa Slicer if you have a Prusa printer
- UltiMaker Cura for everything else
Cura is the better choice for beginners—it has a friendlier interface and good defaults.
Materials
PLA is the right choice when you're starting out. It's easy to print, requires lower temperatures, is pretty durable, and is cheap. Optimal settings: 210°C nozzle, 60°C build plate.
PETG is more heat-resistant but trickier. It needs 240°C nozzle and 80°C build plate. Important: do not use bare smooth surfaces for PETG—it adheres too well and can damage your build plate.
ABS has been historically popular but is genuinely difficult to print. Skip it until you're comfortable with the basics.
Key Slicer Settings
- Nozzle Diameter: Standard is 0.4mm. Smaller = more detail, slower. Larger = faster, less detail.
- Layer Height: Typically half the nozzle diameter. Thinner layers = better surface quality.
- Infill: 20% is usually enough. Going higher wastes material without much benefit for most prints.
- Support: Generates temporary structures for overhanging features. Remove after printing.
Things That Actually Matter
Clean your build surface. A dirty build surface is the most common cause of failed prints, full stop. Isopropyl alcohol or warm soapy water removes the oils from your hands that prevent adhesion.
Level your bed. This ensures consistent first-layer adhesion across the whole surface. Some printers do this automatically; others require manual adjustment. Either way, don't skip it.
Calibrate your Z-height. The first layer needs to be close enough to the bed to stick, but not so close that you're gouging the surface.
If you have questions, feel free to reach out. 3D printing has a learning curve but it flattens out quickly once you've done a few prints.