What it is
3D printing, also called additive manufacturing, builds an object layer by layer from a digital model instead of cutting it from a block. The model is drawn in CAD, exported as a mesh such as STL, and run through slicer software that turns it into layers and toolpaths, usually as G-code the printer follows. There are several processes, including resin printing (SLA) and powder-based methods.
The most common at home and in shops is FDM, fused deposition modelling, also called FFF. A heated nozzle melts plastic filament, such as PLA, PETG or ABS, and lays it down one line at a time. The RepRap project, started in 2005 at the University of Bath, set out to make open source printers that could print many of their own parts, and much of today's hobby FDM hardware grew from it.
How I use it
- I build homemade 3D printers.
- I use FDM printing for the parts nobody stocks anymore, so a one-off bracket or discontinued piece becomes an afternoon instead of a six-week lead time.
- It sits alongside the Raspberry Pi and sensor work as part of the hardware layer under Rental Pilot, treated as part of the stack rather than a separate world.
3D printing is the right tool when a part is small, one-off and hard to get. A bracket or a discontinued piece can take weeks to source, or can be printed by the afternoon. I build my own printers because it means I understand and can fix every part of the machine, which is the same reason I prefer a Raspberry Pi to a locked vendor box.
Questions
Can 3D printing replace hard-to-find equipment parts?
For many small, non-critical parts, yes. I print one-off brackets and discontinued pieces so a long lead time becomes an afternoon. Load-bearing or safety parts need the right material and testing, or a proper replacement.
Do you build your own 3D printers?
Yes. I build homemade FDM printers. Building them means I know how every part works and can repair or change it myself.