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Entry posted byGinaAugust 9, 2017
This is a larger 3D printer with a print bed size of 300mm square and a build height of 350mm.
11 CommentsRecommended CommentsGina9,136
Titan printer front view with door off.
This printer is based on the RepRap principle with all parts readily available and all designs open source. Furthermore, this principle often makes use of one 3D printer to make parts for another and this printer embraces this principle wholeheartedly.
The construction is based on a box to provide the main framework and this also provides a fume cabinet for using ABS filament which gives off noxious fumes when printing. To provide views of the printing process three sides and the top of the box are clear acrylic sheets. An opening front door provides access. Base and back are currently 6mm plywood with appropriate bracing but Im considering replacing it with thicker material. In line with the RepRap principle the corners of the box are made from many 3D printed plastic sections including door hinges and catch.
For the main movements in X, Y and Z directions, V-slot aluminium extrusion is used in combination with matching ball bearing wheels. This provides smoother, more accurate and more reliable movement than stainless steel round rods and linear bearings. It is also a lot lighter than stainless steel rods. This printer (as can be seen) moves the nozzle in the XY plane and the print bed to provide Z motion. This arrangement was chosen because the X and Y axes have the main movement and reduces the effective moving mass.
The drives use ultra-low stretch and very strong fishing line cord rated at 100lbs breaking strain. This is driven by drums and runs over ball bearing pulleys for the X and Y drives. This arrangement uses fixed motors and avoids having their rather high mass on moving parts. The Z drive uses 3D printed spur gears to provide a reduction drive from stepper motor to drive drum. The drum is on a horizontal axle and simply lifts or lowers the bed with cord. As with the X and Y stepper motors, the Z motor is also mounted on the back panel.
The box makes use of 500mm square x 4mm acrylic sheets providing right-angle corners. The build volume is about 300mm (1ft) cube. The printer has been designed to be capable of printing with any sort of filament of 1.75mm diameter with an extrusion temperature up to 300C and bed temperature up to 150C, though I have only tried with 280C and 110C. I am currently using a 0.8mm nozzle though other sizes are available (0.4mm, 0.6mm, 1mm and 1.2mm). Printing surface is borosilicate glass 300mm square which is heated with a 24v 300W heating pad.
The electronics uses the RepRap standard Arduino Mega 2560 microprocessor board and the RAMPS interface board, powered by a PC style ATX PSU with +5v and +12v power rails and providing the power for the stepper motors and hotend heater etc. Power for the print bed heater is provided separately by a 24v PSU. Heating is quite fast taking about 4 mins to get from 20C to 100C.
I had originally designed this printer to use Bowden filament feed but this proved so troublesome that I made the decision to use direct feed with a small, lightweight extruder and stepper motor mounted on the X carriage. This is theE3D Titan Extruder(the name is a coincidence – I named my printer before their extruder came out) and is not only small and light but is reckoned to have a superior hobbed shaft. I am also using their Volcano hotend with better filament heating and flat ended nozzles.
In addition to the 0.8mm nozzle I have also been printing with a smaller 0.4mm nozzle and produced quite high resolution prints using 0.3mm or 0.2mm layer height. Both these nozzle sizes have been used with ABS, PETG and TPU filament successfully. The genuine E3D V6 hotend with E3D Volcano heater block and nozzles has enable printing with the very soft and stretchy TPU filament which needs good support right from hobbed shaft to nozzle.
I am now printing with a large 1.2mm nozzle which this larger printer was originally designed for. The Volcano heater block and nozzles provide much faster heating and enable speeds of 50mm/s even with the 1.2mm nozzle. So far Ive used only PETG filament with the 1.2mm nozzle. Im using a 1.0mm first layer height with 120% filament feed whilst the rest are with 0.8mm layer height and normal 100% filament feed rate. Im using half speed printing for the first layer to help with adhesion to the print bed.
Software is Repetier Host with CuraEngine slicer. Firmware is the latest version of Marlin.
Im trying to go back to the 0.4mm nozzle but its bunged up – apparently with TPU filament but I cant seem to shift itI have it heated to 290C and the red TPU is slowly dripping out and a tiny amount will come out when Nylon filament is pushed hard down into the nozzle from the top. I need some 0.4mm steel wire to push through…
I found a resistor with wires less than 0.3mm diameter and managed to push that up into the nozzle when hot but it still didnt clear the nozzle. I have now put a 0.6mm nozzle in and will order another 0.4mm nozzle (or two) – its not worth spending too long trying to recover a nozzle that costs less than a fiver.
Ive put a 0.6mm nozzle in the Volcano hotend and set up for that – printing is now fine particularly with PETG.
I have also used this printer with ASA and Nylon successfully. It has been myworkhorse printer recently since my Pilot printer was having problems. The Pilot has now been dismantled and replaced by myGinaRep Mini 3D printerwhich is virtually finished and working very well.
The large size of this printer is really too much for the living room which I am tending to return to normal use rather than a workshop, having mostly cleared out the room I want to use as a workshop. Hence the Titan printer will be going in the workshop. With this in mind, requiring remote operation and the results of using a more advanced control system on my Mini printer, I am about to upgrade from Arduino Mega and RAMPS to the Duet WiFi control board. This uses a web interface with total remote control from a web browser.
Gathering data for the Duet from the Arduino Mega. X=59.5s/mm, Y=59.5s/mm, Z=515s/mm, E=418.5s/mm. Z probe offset=-2.5mm. Ill have to measure the Z probe XY offsets.
Duet WiFi control board all set up and ready to connect up.
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