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Path: Laser Etching & Engraving > Electronics Design & Production > 3d printing > CNC Machining Milling and Plasma Cutting
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Led Laser Etcher Engraver is the simpler of all the technologies. The materials that are to be processed  can be acquired locally.  Entry level is in the under $300 range and the learning curve is weeks. Not to be discounted is that there are dangers associated with operating a laser that can be harmful to your person and belongings. Excellent Ventilation and non-flamable surroundings are warranted. 
Lightburn.
Wood
Plastic
Bamboo
Slate
Glass
Anodized
Aluminum
Cardboard

CNC plasma cutting can be operated as a job shop for local hobbyists or businesses.  Products that come out of plasma cutters are of high mechanical ability.  Entry level cost is in the two to four thousand dollar range.   E-Machine Shop X-ometry     There are electrical  noise issues with plasma making it more difficult to set up. Consumables are less in need of replacement as often as CNC's parts. CNC has a bit of a learning curve. You can download and emulator software like CAMotics to facilitate learning your way around before investing in a machine. Highly recomended as that you will be able to tell in short order just how much machine you might be interested in commaniding.
Plans
DIY Build
Use Cut 50L Low frequency Start
Amazon Version Known to Work
Ebay Version
Alternate CNC Rated
Samadre

Plasma Cutter for Table DC Non touch  cuts to 1/4 clean 1/2A" maxImage 2 - Air Plasma Cutter 50Amp Non-Touch Pilot Inverter DC Portable Cutting Machine
Steel
Aluminum
Stainless
Brass
Copper
Iron

3d printing is the next easiest requiring an initial  investment in the same range but the materials are not readily available and the learning curve to enable to put out a marketable product requires substantially more time. One can download files that are ready to go but it still generally takes some dialing in before there is results that are marketable and entry level machines are not capable of any substantial degree of throughput necessitating printer farms which are generally occupied by higher end machines of increased reliability.
ABS
TPU
PLA
Nylon
PETG

CNC Milling can produce high precision parts of robust mechanical cability. Long learning curve and high maintenance relative to other forms of desktop manufacturing.   There are Services that offer the capability to the desktop mfg. entrepreneur that can help with proving  a design concept without investing thousands. There are entry level machines but the cost of having a service company provide a finished product often undermines the validity of doing it in house. Software can be pricey if not stand alone and using Sketchup or Easel to output gcode into a stand alone interface such as the MKS DLC32.  To test files prior to running on a machine it is wise to run them on an emulator first. Not needing a PC and Linux CNC E.... or Mach.
Drip Controller. 
Ebay DNC Drip

Combination Laser and CNC machines are available that are interesting for folks doing small pcbs and laser etching of small parts such as  business cards.  DIY
Aluminum
Brass
PCB
Acrylic

Water Jet WAZER  ~$8000
This Klutch® Mini Milling Machine is a cast iron milling machine that runs vibration free for smooth operation. The 1/2 HP, 110V variable-speed motor with a 2-speed gearbox delivers 350 Watt power. Milling head and column tilts to 45° left or right for added versatility. ETL listed. , Horsepower: 0.5, Chuck Size (in.): 1/2, Dimensions L x W x H (in.): 20 1/2 x 20 1/16 x 29 15/16, Drilling Capacity (in.): 1/2, Light Included: No, Speed (RPM): Variable, Stand Included: No, Volts: 110, Worktable L x W (in.): 3 5/8 x 15 3/8, 360° Head Swivel: No
Motion Control
CNC  lends itself to motion control for Robotics and Movie Making.  We have developed software
for generating files  to control and position  lighting and cameras.



Scanning Photogrammetry and Reverse engineering.
Goes hand in hand with motion control.