Thanks to Martin Schneider for his great design of the Original Open Press Project.
https://www.thingiverse.com/thing:2841592 and https://openpressproject.com/
Thank you to Hefrimu who created a load of improvement to form the Open Art Press: https://www.printables.com/model/39653-open-art-press Which includes stronger gear teeth, use of helical gears, and an improved handle.
Nevertheless I found a few ways to improve on these already excellent projects, by creating the following refinements v1.1.
- New Knobs - for the top of the press screws.
- Changing to standard hardware - To make it easier to assemble without needing to customise metal parts. And creating the hardware list below.
- Longer Print Table 189mm - I didn't do any new CAD here, I just arranged 2 tables carefully onto the print bed and printed them as 1 object.
- Simplified Top Roller - removes the ball bearing groove, I found that ball bearings are not needed.
- New Handle - Micro tweaks to improve tolerances.
Hardware List - for Open Art Press v1.1
For the Press screws (see the photos for how these assemble):
- 2 off M5 by 50mm hex head bolts as the press screws
- 2 off M5 Nut pressed into the frame
- 2 off M5 Dome head nuts
- 2 off M4 Washers push or glue into the to top of the roller carrier, to receive the dome nuts.
To fix the frame together:
- 4 off M2 by 8mm Philips head Self Tapping Screws - to fix on the name plates and hold the frame together.
- 1 off M4 by 35mm Cap head bolt - to fix the top of the frame together.
- 1 off M4 Nut
To fix the handle together:
- 3 off (size to check) wood screws to fix on the handle and lower roller.
Printing Instructions
- Printed in PETG with 0.2mm layer thickness 50% infill and 4 walls, top and bottom.
- PETG can be sanded a lot better than PLA to create a better final surface.
- On an Ender3 it takes about 1.5 to 2 days to print all the parts.
- The lower roller is the only part that I used support for, to hold up the gear teeth.
Assembly
- I found a couple of hours of careful sanding was needed to make the running surfaces clean and smooth.
- I used a white lithium grease from my bike tool kit on the bearing surfaces.
Compatibility
- All v1.1 parts are fully compatible drop in replacements to the Hefrimu Open Art Press.
- Only the knobs are compatible with the Original Schneider Open Printing Press.
I've got a whole load more refinements to make, so I will do some more updates at at some point.