3D Printer Workbench 2020

Workbench for FreeCAD

https://github.com/gbroques/ose-3d-printer-workbench

Use Case

We have a specific need for Summer X 2020. We will be building both the standard size version with 8" bed, and also a version with a 12" bed. We think that using the same 8 mm Universal Axis and 1/8"x1.5" angle frames and printed corners, we will be able to build fast (in terms of motion) printers up to about 16" print beds, and slower printers with up to about 24" print beds. Slower because there will be more vibration, so quality printing can be retained by moving slower. Slower motion does not reduce deposition rate as long as large nozzles (1.2 mm) are used - which have typical 25-50 mm/sec speeds. Thus, a larger 24" bed printer can still be built using the same materials as the D3D Pro.

To scale the 1/8"x1.5" to larger size - it is convenient to print out the frame corners at 200% size - without modification. In this case, 1/4"x3" angle can be used, and this is expected to produce up to 4'x4'x8' tall printers using 3D printed corners - printers that are suitable for printing large construction panels using the Supervolcano Nozzle with deposition rate of 20 lb/day. We are also planning to build the 4x4x8 foot printer as such during Summer X 2020 - which will be a simple 200% scale-up of the existing D3D frame parts. The actual axis to be used here will likely be a 1" universal axis.

We have observed an advantage of using hollow shaft instead of 1" solid shaft for the 1" universal axis. We can use schedule 40 3/4" pipe for this purpose, which is close to 1" OD. It is not exactly 1", so we must use custom linear bearings. This is doable using the 3D Printed Linear Bushing. While this bushing is printable in PLA, we will work on printing bushings using Nylon or Acetal Filament using a high temperature print chamber. This is all planned for the first month of Summer X 2020.

Links

• 3D Printer Workbench Work Proposal by G Log
• 3D Printer Workbench - 2019 work by Ruslan Log