Ceramic 3D printers, despite using the same fundamental mechanism as standard FDM printers, are much harder to find. Part of this comes down to the material properties of fired ceramics versus thermoplastics, but they’re also significantly harder to build; for example, in his ceramic printer build, [Joshua Bird] had to deal with severe material shrinkage, collapsing bridges, and the surprisingly abrasive effects of clay.
The centerpiece of the printer is the clay extruder: an air compressor pushes clay along a tube into the extruder, which uses an auger to squeeze the clay through the nozzle, while a gap at the top lets trapped air escape. The extruder has enough control for successful retractions, but rheology remained a challenge: the clay needed to be soft enough to flow through the nozzle, but stiff enough to form bridges without collapsing. [Joshua] thus pressurized the clay as much as possible, making it possible to use stiffer clay mixtures. The extruder’s greatest challenge was longevity: [Joshua] tried many 3D-printed plastic augers, but the clay abraded them all much too quickly, often in under an hour of use; a 3D-printed stainless steel extruder solved this.
Printing in ceramic isn’t a simple process: for each part, [Joshua] had to mix the clay, load it into the tube, clean the extruder, actually print the object, let it dry, fire it, apply glaze, and fire it again. The clay’s shrinkage during drying and firing destroyed many prints, but [Joshua] was nevertheless able to print a double-walled cup, a decorative climbing-themed cup, and even a chain-mail mesh.
The 3D printer’s motion system is a polar design, an adaptation of his earlier non-planar 3D printer, which might eventually make it easier to print overhangs. We’ve previously seen a similar auger-based clay extruder, an approach reminiscent of direct-granule FDM printing.
The best 3d ceramic printer Ive seen used a Moineau prgressive cavity pump. It uses a single “squiggly” metal shaft (the rotor) that rotates eccentrically inside a flexible, matching spiral sleeve (the stator) to move thick, abrasive materials like clay at a consistent rate without pulsationIts
Thanks for the comment friend. My goal with this project is to develop it further to produce medical-grade ceramic implants (think hip replacements etc.)
3D printing is a breakthrough technology which enabled highly precise, patient-specific manufacturing with complex geometries that would be difficult or impossible to achieve with conventional machining. It also supports efficient prototyping and rapid iteration, helping us refine microstructure and finishing processes to improve biocompatibility, strength, and long-term reliability.
Kudos on the engineering solutions. As for bridging, to me it cries out for a second scaffolding material, acknowledging that this brings its own challenges to the kiln / drying steps.
I wouldn’t mind 3D printing with ceramic. The downside would be having to own a kiln
I wouldn’t mind a service that can 3D print and bake ceramics for me either
I wonder about piping it to the extruder as a very watery slip, then using something akin to a very rough vacuum drier to remove the bulk of the water, pushing the condensed clay off the filter mesh with an augur as it builds up. You could get rid of the plunger full of clay, reducing the inertial mass significantly, if you can get enough water suction pressure, you’d only need an in feed and a water return pipe.
Perhaps the separation could even be done a bit like a cyclone dust extractor with some sort of tapered hollow augur bit that has an inner wall made of mesh.
Hello sir, I kindly appreciate your feedback. Your idea is clever. Using a watery clay slip and a suction/drying step to reduce plunger mass could make feeding much more responsive, and a cyclone draft separator approach does have parallels with what people do in other particulate handling setups.
That said, running something vacuum-based on a printer can be risky: dust-extractor-style setups often produce noticeable vibrations, and those vibrations can translate into layer artifacts, ringing, or unreliable motion of lightweight printer frames. For that reason, I’d be cautious about mounting the separator/auger assembly near the print system, and I’d prioritize rigid mounting where needed, plus stable suction control.
On the advantages side, Anet 3D printers (when properly tuned) tend to be a good platform for experimental extruder concepts because they’re straightforward to modify, have a convenient baseline for adding custom hardware, and their printers commonly support practical upgrades (stable hotend mounting, better extruder gearing, and improved firmware settings) that help maintain consistent flow even when the feed mechanism is unconventional.