Bowden Filament Drives21/12/2016
DIPS05 Precision proximity sensor11/06/2018
Base frame and back wall
The strong frames provide a rock-solid support for the print-surface and dual extruders.
Different print surfaces can simply be clamped into place. (Alu, Glass, Timber, etc.)
Print bed heating
The print surface is heated with a 300W pad (0 to 125°C)
Print bed levelling (Coarse adjustment)
The print surface is levelled mechanically with three grub-screws and secured with wing nuts.
Print bed levelling (fine adjustment)
The fine adjustment is done automatically by the DIPS05 precision infrared proximity sensor with an accuracy of 50µ.
Before each object is printed, the print surface is mapped to correct inaccuracies of the print surface.
The print head / proximity sensor is driven to 16 grid points on the print surface. (The amount mapping points can be adjusted in the firmware. From 9 to 81 grid points).
The grid point distances between extruder and print bed is measured and stored.
When the 3D print process starts the stored values are used to move the print bed up or down to correct inaccuracies. This makes sure that the first and subsequent layers of plastics are deposited accurately within an accuracy of 50µ.
The print head has been designed to accommodate the very popular E3D extruders.
Most 3D printing problems are associated with bad adhesion of the first layer.
A badly deposited first layer is due to incorrectly set distance between extruder nozzle and print surface.
Bad adhesion causes:
- Objects prematurely popping off the print surface.
- Bird-nests of filament instead of the intended object.
The Rock V3.0 – Print head has been designed with additional manual fine adjustment of the E3D extruder attachments by +/- 5 mm in height.
The manual E3D extruder height adjustment can be done while the printer is in operation and melted plastic is pushed out of the extruder nozzles.
The fine E3D extruder adjustment makes it possible to fine tune the filament deposition onto the print-bed to its best results thus avoiding the usual adhesion problems.
Of course, when printing with one E3D extruder only, moving the unused E3D extruder nozzle away (up) from the hot printed surface of the active E3D extruder, preventing scratch damage, is another advantage.
Speed controlled filament cooling fans directed to the extruder tips are standard.
White bright LED’s point to and illuminate both extruder tips / plastic extrusions.
Print head X & Y motion
The X & Y axis motion of the print head is supported by 6 linear bearing block & tracks (Two at the print head and 4 at the top frame front/back and left/right. These precision linear bearing blocks and tracks provide stable and accurate positioning of the two extruders.
The axles are accurately driven to position via parallel timing belt assemblies.
The print surface is illuminated by 2 LED strips mounted on the top frame left & right .
3 simple hanging and interlocking draft shields are supplied with the printer kit.
The draft shields can individually be added or removed from the printer frame.
Drafts from air conditioning or alike that flow over the heated print surface and hot printed object can cause accelerated cooling and print errors.
Certain 3D printing plastic filaments that are melted and extruded to bond with the previous printed layer, if cooled too fast may not bond correctly and cause layers detaching
For better display the pictures below show the acrylic sheets with the protective paper left on