I would like to understand the differences between rafts, skirts and brims. They appear in the software which I'm using to edit my 3D objects.
Can anybody elaborate what are these and what are the main differences between them?
All three of these features are used to improve the quality and success rate of prints, especially those failing due to issues on the first few layers, or due to the small size of the first layer.
A raft is a horizontal feature made as the first few layers of a print, and is used to help with bed adhesion issues, primarily used with ABS. The first few layers printed are the brim (typically prismatic), with the part itself on top of it (with a small separation distance to aid in separation, to allow the part to be removed from the raft). This separation distance needs to be adjusted to allow the first layer of the actual part to adhere, but also for the raft to be removed easily.
A skirt is a single-layer feature designed to help extruder priming and to establish a stable filament flow for an optimal first layer. They are generally a few passes around the first layer "footprint" in the rough shape of the first layer, but they do not touch the part itself or help adhesion directly (although having a primed and ready extruder helps extrusion on its own).
A brim can be considered a skirt touching the first layer shape. It is used to help adhesion, and increases the first layer surface area (thus having more area to adhere to the bed). Brims are best used for parts with small first layers that fail to adhere properly. They are generally done as perimeters (as opposed to the crosshatching of infill) to be easily removable without damaging the part.
Rafts are a few layers of plastic a placed on the printing surface before the object is printed. If non water dissoluble filament is used, a bit of an air gap will be placed between the raft and the print itself so it can be removed easily. A raft can help a print stick to the printing surface as it normally has a larger surface area than the bottom of the print. It also allows the bottom layers of the print to contact another layer of plastic so there is less spreading compared to printing on the printing bed itself.
Skirts are loops of plastic that are extruded around the object that is being printed. On the first layer this allows the filament to get pushed through the extruder so that a steady flow can be established. A multiple layer skirt can be used to create a blockage around the print so there is less air movement on the print and the print can cool slower.
A brim is a layer of plastic that is placed on the first layer of the print go allow for better adhesion to the printing surface. It does not extend under the print as a raft does, but only goes from the edge of the print to a set distance away.
Credits: Images from Slic3r
; Custom board based on ATMega2560 to control the printer; Printer should gracefully handle conditions like "out of material", etc. Question: How to select firmware? Are there notable differences between the primary firmware options (Marlin/Repetier) for this setup? From the google code groups, I understand the Repetier has a much cleaner code base, and apparently gives smoother physical performance. Yet, from what I can gather, 95% of the community uses Marlin - is that correct? Given that this printer will have the Pi3 to control "higher functions", is it worth considering a compact
What are the differences, and pros & cons, between 3D printers with varying layouts for moving head vs. moving build plate? Example layouts would include: X Head; YZ Bed; XY Head; Z Bed; XYZ Head; etc. In particular, what are their respective strengths, weaknesses, specializations, maintenance considerations, etc.?
What are the main differences when using ABS over PLA and vice versa?
When I've printed an object I've had to choose between high resolution and quick prints. What techniques or technologies can I use or deploy to speed up my high resolution prints?
Bad filament with changing diameter causes an uneven flow of plastic out of the nozzle. Besides buying very high quality filament (do we really want to be dependent on professional Filament producers?), what other ideas and methods could be used to mitigate the differences in diameter? Could a pellet extruder be a solution?
How to check leveling of printer bed ? What should be ideal values on x,y and z to ensure printer bed is flat and there is no angle between plane of nozzle and plane of printer bed ?
around a bit more before attempting this fix on my main board. I'll edit this post as I continue the project. Update: New Board Replacement So, I've now attempted the fix on the newest board (the reason for this question). The results of this board are the same as the old one. I actually get power on the main board, but the LCD screen just shows two solid lines. I've taken pictures of what I've... with the same model board with no apparent fix for the commonly faulty voltage regulator. I can't afford the now $500 replacement board, so my option is to replace the faulty component and hope no further
I have been studying the differences between version 2.x and version 4 of the P3Steel frames - in particular the AC08 bracket at the top of the frame which secures the top of the smooth bars and threaded rods of the Z axis on both the left and right sides. Here is the laser cut parts, for version 1.x, showing the part labelled as AC08: Version 1.x/2.x has the AC08 bracket with two holes, one for the threaded rod and one for the top of the smooth bar (from the lasercut image): However, in version 4, the corresponding top Z axis bracket only has one hole for the smooth bar and just
of the shifted layers are quite reproducible. From what I understand problems such as these along the x-axis, are generally caused by broken cables, which are pressed upon as the extruder moves...A few weeks ago a shift between layers in the y-direction (from the front to the back of the printer) of my Makerbot Replicator 2 appeared. All prints have some small shifts between layers, but if the extruder has to move large distances (e.g. when I print the same object near the front and near the back of the print bed), they can reach up to 2 cm or so. In those cases the extruder seem