Here is a low cost mill I designed for the third world market.
Starting price is $350 for a knockdown kit. It ships partly assembled to fit in a smaller box to save shipping costs. Runs on GRBL
Has a 440 220v watt trim router vs the Chinese 200 watt dc spindles and can take a 1/4 inch but not the 1/8 on the cheep china at this price point.
First test cut. 15mm circle in a 25mm square.
For the record that is .0003 inces off.
Not too bad for a thread rod drive machine.
Frame is extruded aluminum with machined half inch acrylic parts.
The thick acrylic is much stiffer than delrin and cost was a consideration.