A robust and sturdy 3D Printable Build Platform/Heated Bed Standoff for the He3D K280 Mega Delta or any other delta 3D printer built with 20mm slotted extrusions. The design replaces the adjustable spring standoff supplied with the K280 kit, which proved problematic in my environment. A threaded M3 hole on top of the standoff facilitates mounting the bed with M3 screws.
The main advantage of the fixed standoffs is that once the printer is calibrated, it will likely remain so for the rest of its life. My K280 has been in production with these standoffs since the fall of 2017. The only adjustments I had to make since, was to adjust the overall height when changing nozzles, using the “baby step” (micro stepping) software function.
The parts can be easily 3D printed, without any support, on a modern inexpensive 3D Printer. They can be printed with a variety of materials, including PETG, ABS and many other types of heat tolerant printable materials.
ABS works very well for this application. Alternately, PETG should be almost as good, but I have not tested it.
I strongly recommend against using PLA to make this object because during normal operation of your 3D printer, it will be exposed to high temperature exceeding ~55 C (~ 130 F). At such temperature, PLA will most likely warp.