Back to the concept of a foldable reprap using a scissor-like mechanism for the Z axis :)
Release status: in progress
- tensioning the z-belt should be done in the upward direction, in order to tension against gravity
- change the aluminium flight case (not cheap) for a regular wooden flight case (easier to use and customize)
- move the linear rail 5mm closer to the pivot, in order for the end rail (printed part) to play its role of mechanical stop
- fine tune E step value (837 for start)
- test print
- tweaking RepRap Firmware for the scissor Z... (will need help here)
implementing the extruder, cable-chains, sorting the wires, adding parts printed in flexible filament for dampening the chocks and vibration when moving the case
the wheels are taking more place inside the case than what I thought : I am changing the orientation and position of the electronic (the Duet will be in the lid instead of the base), it will also makes for a better path for the wires/cable-chains and better use the space.
once assembled there is more rigidity than what I feared to have, thanks to alternating the orientation of the scissors (good intuition here) the material works mostly in its horizontal plane, so even plastics seems fine (except that a scissor broke for pushing to far) - [video of a test move]
scissor movement, smooth and without play along the linear movement (thanks to press-fitting everything), but some angular play in one of the bearing (balls/cage).
press-fitting the 695zz bearings (5x13x4mm) and D5L10 spacers with a vise works (the spacer outer diameter is 5.1mm in fact)... but using D4L10 shoulder screws and 604zz bearings (4x12x4mm) instead will be easier, I will keep that in mind for the next iteration.
360x360mm footprint, almost the same as the FoldaRap with a roll of filament. 4mm aluminium frame, H-bot, linear rails, e3D-titan, geared-nema17 for the Z-belt. And should have a 150x150x150mm build area.
was imagined during the initial concept of the "FoldaRap2" mid-2012, then named "Mondrian" when it was not pursued at the time